PRODUCT DESCRIPTION: 1. Transmission range: 10 meters 2. Function: call function, support music 3. Bluetooth protocol: 4.2 4. Channel: Stereo 5. Usage: neck-mounted 6. Whether single or double ear: bilateral stereo 7. Color: red, black 8. Battery capacity: 100mAh 9. Product size: 39*39*17mm 10. Product weight: 16g 12: Charging method: Micro-USB charging 13. Support protocol: HEP, HSP, A2DP feature of product: 1. Cable clamp design, adjust the length of the wire at will, reduce the friction between the wire and the clothes, wear it firmly, and resist vigorous exercise 2. Adopts 30 oblique in-ear design, ergonomically away, closely fits the contour of the ear canal, light and compact, and comfortable to wear for a long time 3. Chip upgrade, silicon microphone noise reduction call 4. Waterproof and sweatproof, without fear of rain scouring 5. High-quality polymer lithium battery coupled with engineer's optimized control effectively enhances battery life, superb listening, 8 hours, 200 songs 6. Drum-shaped cavity, professional diaphragm, V5.0 chip built-in high-resolution decoder, supplemented by high-frequency encoding technology to play AAC/SBC, built-in 6mm moving coil speaker unit and polyester film diaphragm to enhance engine output. 7. Low stress, HIFI sound quality 8. Magnetic design, refuse to wrap 9. HD sound quality microphone, simple wire control, no delay in game 10. Stable transmission distance of 10 meters, mini portable, easy to pocket 11. Tensile is not easy to break 12. Support multiple devices and applications Desktop computers, laptops, tablets, mobile phones