JBL Tune 770NC Noise-Canceling Wireless Over-Ear Headphones Black

Capacity and charging behaviour are tested so the battery is fit for everyday use.

The display is checked for dead pixels, shadowing, dust under the glass, and uneven colour.

Included charging accessories are inspected for safe connections and reliable power delivery.

Units are cleaned inside and out so they arrive presentation-ready.

Front and rear cameras are tested for focus, clarity, and sensor defects.

Previous owner data is securely wiped before the device is listed for sale.

Network lock status and SIM compatibility are verified for UK networks.

Trays and readers are checked for physical damage and correct detection.

Power, volume, and other physical controls are tested for consistent response.

Where repairs are needed, only approved components are fitted during refurbishment.

Serial and IMEI details are recorded and matched to the device identity.

Internal indicators and seals are inspected for signs of liquid exposure.

Charging, data, and audio ports are tested for a firm fit and stable connection.

Fingerprint and face unlock sensors are verified on devices that include them.

Location services are tested to confirm accurate positioning.

Proximity, ambient light, and similar sensors are checked for correct readings.

Hinges, sliders, and other moving parts are checked for smooth, secure operation.

Wireless connectivity is tested on the bands your device supports.

Microphones and speakers are checked for clear call and media playback.

Camera flash and notification LEDs are tested where the device includes them.

Extra checks for category-specific features such as styluses, eSIM, or NFC.