Bluetooth 5.3: Our earphones utilize the latest Bluetooth 5.3 technology for improved transmission and stability. A dependable connection of up to 10~15m allows for stable output and an impressive audio experience. 9D Stereo Sound: Equipped with a 16 cm horn and Zhongke Lanxun chip, the elevates your audio with 9D stereo sound that is both clear and invigorating. Can be used for music, podcasts, or calls, this earphone delivers a superior audio experience. Dual microphone call noise reduction with beamforming technology, always keep clear calls, click on the smart voice assistant, help you enjoy a relaxed life Spatial surround sound Product name: Hanging ear Bluetooth headset Bluetooth chip : AD6973D4 Bluetooth version: Bluetooth 5.3 Communication distance : ≥10 meters (without any obstacles) Charging time : 0.8 hours Headset life: 8 hours of playback time Battery type: polymer battery Single headphone battery capacity : 40mAh Support agreement: HFP/A2DP/AVRCP/AVDTP/AVCTP/GAVDP/SDP Audio decoding : SBC/aptX Main functions: music play/pause, volume increase or decrease, up and down song switch call prompt, call noise reduction, three-way call voice assistant Material: PC+ABS colour: Black Package Contents: 2 x headphones 1 x charging case Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.