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Quality Control

Discover how ALOVA ensures the highest quality in every product.

Step 1: Incoming material inspection

Step 1: Incoming material inspection

Basis: Pre-production samples or spec sheets serve as the standard for incoming material inspection. Materials must be inspected prior to mass production.

Inspection Scope: All incoming materials undergo testing, either through full inspection or sampling, to ensure they meet quality standards before proceeding to production.

Items Inspected: The inspection covers incoming materials from suppliers, including plastic shells, vibrators, speakers, motherboards, batteries, charging cables, instruction manuals, packaging, and more.

Document Comparison: Instruction manuals and packaging are also verified against customer specifications, ensuring accurate colors, content, and processes.

Step 2: Dustproof Process

Step 2: Dustproof Process

All personnel must wear dustproof clothing and shoe covers and pass through the air shower room before entering the production area.

This process is designed to prevent human static electricity from damaging electronic components, maintain a clean and hygienic production environment, and ensure that products remain clean and tidy.

Step 3: SOP (Work Instructions)

Each process has a corresponding SOP (Standard Operating Procedure) to ensure that all workers understand the production standards for their workstation.

Before product launch, all employees receive training on proper assembly methods. The engineering department then issues an operation instruction, and production proceeds according to these established standards.

Step 3: SOP (Work Instructions)

Step 4: Soldering Station Safety

Equipped with Ventilation Fan: Small fans are installed to remove soldering fumes, ensuring a healthier environment for workers.

Eco-Friendly Soldering Materials: Uses environmentally friendly soldering irons and lead-free solder.

Compliant with European Environmental Standards: The entire process adheres to strict European environmental regulations.

Step 4: Soldering Station Safety

Step 5: Battery Power Testing

Voltage and Current Check: Verify that the battery’s voltage and current meet standard levels.

Capacity Analysis for Bulk Shipments: Large batches of batteries undergo testing with a battery capacity analyzer in the lab to confirm capacity and compliance with other quality standards.

Step 5: Battery Power Testing

Step 6: UV Glue Application

Purpose: Provides waterproofing, sweat resistance, and drop protection.

Process: UV glue is quickly cured under UV light. Drop protection is primarily achieved by securing the circuit with UV glue, ensuring that the circuit remains intact and undamaged if the earphones are dropped.

Step 6: UV Glue Application

Step 7: Button Function Test

Purpose: Ensures that all buttons function properly and deliver a clear tactile response.

Process:

Each unit’s buttons are manually pressed to verify accurate response and a consistent “click” feel.

This confirms that core functions like power, volume, and mode control work reliably and intuitively for the user.

Step 7: Button Function Test

Step 8: Pressure Holding Fixture

Step 8: Pressure Holding Fixture

Purpose: Ensures tight and secure assembly of structural components.

Process:

A pressure fixture is used to hold the upper and lower parts of the earphone firmly in place during bonding.

This prevents misalignment or excessive gaps, ensuring a solid fit and consistent product appearance while enhancing durability.

Step 9: IP68 Product Coating & Potting

Purpose: Ensures the internal cavity is fully sealed to meet IP68 waterproof standards.

Process:

  • A specialized waterproof coating and potting compound is applied to critical internal components.
  • Slight glue overflow is an intentional part of the process to guarantee complete sealing.

 

While this strengthens internal protection, it also requires careful control to maintain a clean and professional outer appearance.

Step 9: IP68 Product Coating & Potting

Step 10: Automatic Dispensing Machine

Advantages: Efficient, fast, and reduces labor costs.

Function: Ensures even glue application and rapid production. The automatic dispensing machine is used for applying glue to components such as vibrators, casing materials, and buttons.

Step 10: Automatic Dispensing Machine

Step 11: Shielded Room Testing

Conducted in a dedicated shielded room to prevent Bluetooth interference.

Each product undergoes testing with a Bluetooth analyzer to verify Bluetooth connectivity, correct device name, button functionality, microphone performance, and charging indicator lights.

We uphold a zero-tolerance standard for any functional defects.

Step 11: Shielded Room Testing

Step 12: Charging and Aging Test

Charging Process: All products are fully charged before shipping. Each product charges for approximately 1-2 hours to ensure some battery life remains when the customer receives it after long sea transport.

Sampling for Testing: 1% of each batch undergoes testing. Due to the long battery life of the headphones, a full batch aging test is not feasible, but a sample is tested.

Aging Test Procedure: Products are fully charged, then connected to a Bluetooth tester to play random songs, discharging fully, recharging, and repeating the discharge-recharge cycle to evaluate battery endurance and performance.

Step 12: Charging and Aging Test

Step 13: Radio Frequency Test

Purpose: Ensures stable and consistent Bluetooth performance between left and right earbuds.

Process:

Specialized RF equipment is used to test the antenna alignment, transmission frequency, and signal strength of each earbud.

This step verifies that both sides maintain synchronized and reliable wireless connectivity, preventing issues like pairing failure or audio dropouts.

Step 13: Radio Frequency Test

Step 14: Electroacoustic Test

Purpose: Verifies the audio performance and consistency of both speakers and microphones.

Process:

Each unit is connected to professional electroacoustic testing equipment to measure key parameters such as speaker frequency response, volume level, and microphone sensitivity.

This ensures clear sound output and accurate voice pickup across all devices, maintaining consistent audio quality for end users.

Step 14: Electroacoustic Test

Step 15: IP68 Product Airtightness Test

Purpose: Ensures that IP68-rated products are fully sealed and resistant to water intrusion.

Process:

  • Swimming headphones undergo airtightness testing using a dedicated fixture.
  • A 30%–50% sample from each production batch is selected to check for potential water leakage under pressure.

 

This step guarantees that each tested unit meets the strict waterproof standards required for underwater use.

Step 15: IP68 Product Airtightness Test

Step 16: IP68 Product Leak Point Analysis

Purpose: Pinpoints exact locations of water leaks in IP68 products.

Process:

When a product fails the airtightness test, engineers employ specialized leak detection tools to accurately identify the leak points.

They then analyze the root cause and carry out targeted repairs or process improvements to prevent future leaks, ensuring product reliability and waterproof integrity.

Step 16: IP68 Product Leak Point Analysis

Step 17: IP68 Product Card Reading Test

Purpose: Verifies the storage card reading functionality in swimming headphones.

Process:

Each unit is connected to a computer through a data cable to check if the storage card can be properly detected and accessed.

This ensures reliable playback of stored audio files during use.

Step 17: IP68 Product Card Reading Test

Step 18: Appearance Quality Inspection

Method: Glue Cleaning

Purpose: Primarily for swimming headphones, as they require full glue filling. After filling, excess glue may overflow, leaving residue on the headphones.

Workers manually clean off the cured glue on each unit. One worker can clean approximately 6-8 units of the OPENEAR Bone X2 model or around 3-5 units of the OPENEAR Bone F1 model per hour.

Step 18: Appearance Quality Inspection

Step 19: First Batch Sample Verification

Purpose: Ensures packaging and accessories match approved standards before mass production.

Process:

Before full packaging begins, the first batch sample is carefully inspected to verify that its packaging, labels, and included accessories comply with the approved specifications.

All subsequent packaging is then based on this verified standard to maintain consistency across the entire order.

Step 19: First Batch Sample Verification

Step 20: Automatic Film Laminating

Purpose: Enhances product appearance and protection by applying a smooth, protective shrink wrap layer on color boxes.

Process:

Using an automatic film laminating machine, a thin layer of plastic film is evenly applied and heat-shrunk over the packaging.

This not only improves the visual gloss and feel but also protects the boxes from moisture, dust, and minor abrasions during shipping and handling.

Step 20: Automatic Film Laminating

Step 21: Full Box Weighing

Purpose: Confirms that all headphone accessories and components are included in each package.

Process: Each fully packed box is weighed using precise scales. By comparing the weight to the standard reference, inspectors can quickly identify if any accessories are missing or if the package contents are incomplete, ensuring accuracy before shipment.

Step 21: Full Box Weighing

Step 22: Full Carton Weighing

Purpose: Verifies that every carton contains the correct quantity of headphones and accessories.

Process:

Each packed carton is weighed and compared against the expected standard weight.

This step helps detect missing items or packing errors at the carton level, ensuring complete and accurate shipment to customers.

Step 22: Full Carton Weighing

Step 23: Pre-Shipment Quality Assurance

Purpose: Confirms that finished products meet quality standards before leaving the factory.

Process:

  • Random samples are taken from packaged shipments and unpacked for thorough inspection.
  • After verifying product integrity, functionality, and packaging quality, the samples are carefully repacked.

 

This final check helps ensure that customers receive flawless products.

Step 23: Pre-Shipment Quality Assurance

Step 24: Dual-Arm Drop Tester

Purpose: Ensures cartons and contents can withstand impacts during shipping.

Process:

Cartons are dropped from a height of 1 meter on all six sides to simulate shipping drops.

After testing, engineers carefully inspect the carton’s exterior and the headphones inside to confirm there is no damage and all functions remain intact.

Step 24: Dual-Arm Drop Tester

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ALOVA (Shenzhen Alex Technology Co., Ltd.), founded in 2014 and based in Shenzhen, China, is an innovative technology manufacturer specializing in open-ear audio solutions, including air conduction headphones, bone conduction headphones, and bone conduction hearing aids.

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