Features: 1. Integrated BT 5.0 chip, offers fast speed, stable connection, allows transmission of 10-15 m without obstacle. 2. Compatible with mainstream devices with BT function, suitable for multi-platform, multi-system, and major brand mobile phones. 3. Effectively block external noise, and real-time audio calibration can maintain a high-quality listening experience. 4. Ergonomically designed to fit each ear perfectly. Perfect for exercise, running, sports and games. 5. Digital display shows the remaining battery power of the cordless headset clearly, then you have the charge status of your device at all times. Notice: Actual color may be slightly different from the image due to different monitor and light effect. Please allow 1-3cm deviation due to manual measurement. Description: Supported protocols: A2DP/AVRCP/HFP/HSP/SPP/CVC/APTX/AAC Signal-to-noise ratio: 80db BT version: V5.0 Audio format: MP3, SBC Battery compartment capacity: 400mah Headphone battery capacity: 40mah Talk time: about 4 hours Music time: about 3 hours Effective distance: barrier-free 10M Battery compartment charging time: about 2 hours Transmission range: more than 10 meters Voice prompt: Chinese/English Noise reduction: CVC 6.0