REMAX CozyBuds W15 Transparent Ear Clip Wireless Bluetooth Earphone OWS Sports Earphone 1. Bluetooth version: V5.3 2. Transmission range: about 10m 3. Bluetooth chip: JL 6973D4 4. Support protocol: HFP V1.7, A2DP V1.3, AVRCP V1.6, HID V1.0 5. Frequency range: 20Hz-20KHz 6. Rated power: 3mW 7. Impedance: about 16 ohms 8. Battery capacity: 230mAh for rechargeable compartment, 25mAh for headphone 9. Standby time: about 180 days 10. Charging time: about 1H 11. Playback time: about 4H 12. Charging port: Type-C 13. Input: 5V 20mA 14. Weight: about 41g 15. Size: approx. 6.7 x 4.8 x 3cm Features: 1. Crystal compartment design, crystal clear 2. Stable to wear, no falling off during exercise 3. Lightweight and compact, long time wear without ear fatigue 4. PU composite diaphragm speakers, high sensitivity, low distortion, low-frequency more full, highly restore the richer, more vivid sound quality 5. DT8.0 directional sound transmission, sound leakage reduced by 90%, automatic detection of the shape of the ear canal, adjust the integrated sound beam to ensure that the sound is efficiently transmitted into the ear canal 6. Bluetooth 5.3, enhance signal penetration, reduce sound quality loss and delay 7. Large-capacity battery compartment, Type-C charging is more convenient, with the charging compartment lasting a full day of battery life 8. Clip ear design, let your ears breathe freely, open listening, outdoor sports safer