Features: 1. Integrated BT 5.0 chip, offers fast speed, stable connection, allows transmission of 10 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. The in-ear headphones are ergonomically designed to fit each ear perfectly. Perfect for exercise, running, sports and games. 5. The battery indicator 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: Bluetooth-Compatible Version: 5.0 Headphone speaker: 10MM/32 Headphone battery capacity: 40mAh Storage box battery capacity: 200MAH Transmission distance: >10m Talk time: 3 hours Playing time: about 2 hours (80% volume) Standby time: 120 hours Headphone charging time: 1 hour Earbuds size: 2.6*2.4*1.9cm Charging box size: 7.2*3.9*3.1cm