Product description Color: black red Bluetooth version 5.0 Effective distance: 10M Material type: titanium alloy / soft TPE rubber Battery type: polymer 120 mAh Frequency range: 20Hz-20KHz Charging voltage: DC-5V 500mA Charging type: Micro USB Playing time: approx. 10 hours (test with medium volume) Standby time: about 10 days Charging time: approx. 2 hours Size: 158 * 110 * 48mm Delivery content: 1 x earphone 1 X charging cable 1 X manual 1. Easy to carry Open wireless headphones surround the directional sound field, open design, only 18g, sweatproof and waterproof, short service life easy to carry. 2. Protection: Wear it comfortably without ear clips and protect your ears from damage. Surrounding directional sound field The loudspeaker uses the physical-ecological membrane technology. 3. Waterproof: 120 mAh battery life, bluetooth 5.0 chip, lower power consumption, longer battery life, IPX5 lifetime waterproof. 4. SPEAKER UNIT IS EXTERNAL The speaker is near the ear, but is not in the ear and is not blocking the ear canal. Listening to the environment during a call or music, safer on the go or in some scenes and more portable for business. 5. Memory alloy frame design: High-strength titanium alloy metal frame, resistant to compression, breakage and deformation, does not feel when worn, and can be rotated as you like.