Negotiable

                                            Purchased 2 weeks ago and all functionalities are ok.

Key features
Unique Design: Excellent ear clip design of bone conduction earphone reduces pressure on the ear canal, achieving optimal fit and comfort.
Application: The mini comfortable design earplugs firmly fit all shapes of ears, making them 100% safe and stable for running, cycling, training, jogging, hiking, gym workouts, and more.
Stereo Bass: Bluetooth-compatible headset has 3D immersive three-dimensional surround sound, high bass balance, strong signal, and smooth connection when talking and listening to music.
Stable: High sensitivity microphone of ear-Clip bluetooth-compatible 5.3 headphones ensures that your voice is always loud and clear during calls.
Automatically Connected: Remove 2 headphones from the charging box and they will automatically connect to each other. Then simply enter the phone's Bluetooth-compatible settings and select the model to pair the earplugs in one step.
Specifications

Model: T75
Bluetooth version: 5.3
Support protocol: A2DP/HFP/SPP/HID/PBAP
Bluetooth range: ≥10m
Battery capacity: 50mA
Charging box battery capacity: 400mAh
Charging time: About 1 h
Call playing time: About 4-5 h
Speaker size: 14mm
Mic Sensitivity: -42dB±3dB
Frequency response: 40Hz-20KHz
Impedance: 32Ω
Sensitivity: 106±3dB
Charging specification: 5V/1A
Operating voltage: 3.7V-4.2V                                    

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