REMAX CozyBuds W18 Double ENC Intelligent Call Noise Reduction Wireless Earphone Transparent Shell Wireless Bluetooth Earphone 1. Bluetooth version: V5.3 2. Transmission range: about 10m 3. Operating voltage: 5V 4. Support protocol: HSP, HFP, A2DP, AVRCP 5. Speaker driver: 13mm 6. Rated power: 3mW 7. Impedance: about 32 ohms 8. Battery capacity: 300mAh for rechargeable compartment, 35mAh for earphone 9. Standby time: about 90 days 10. Charging time: about 1H 11. Playback time: about 4-6H 12. Charging port: Type-C 13. Material: PC+ABS 14. Weight: about 38g 15. Size: about 5.1 x 2.6 x 5cm Features: 1. 360 degree ACS panoramic sound, digital sound enhancement technology 2. 13MM cicada wing titanium alloy diaphragm sound, thinner, more stable cavity, detail capture more sensitive, less acoustic resonance 3. Whale cavity dynamic structure, with a larger sound area, pure and crisp treble, bass surging and thick 4. Fish scale directional pulse technology, no sound leakage 5. Dual-channel low latency, delay as low as 0.06 seconds, synchronized sound and picture 6. Both left and right headphones are equipped with LDS laser antenna, connecting distance is farther and more stable 7. Ergonomic design, comfortable to wear for a long time 8. Dual ENC Intelligent Noise Cancellation, both sides can be heard clearly in a noisy environment 9. Rechargeable lithium battery, lighter and more durable, ultra-long battery life 10. Supports a wide range of cell phones and tablets with Bluetooth function