Product description Color: black 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: approx. 10 hours Days Charging time: about 2 hours Size: 158 * 110 * 48 mm Package included: 1 X headphones 1 X charging cable 1 X manual 1. Easy to carry Open wireless headphones surround the directional sound field, open design, only 18 g, sweatproof and waterproof, low lifespan easy to carry. 2. Protection: Wear it comfortably without ear clips and protect the ears from damage. Surrounding directional sound field The speaker uses the physical-ecological membrane technology. 3. Waterproof: 120 mAh battery life, Bluetooth 5.0 chip, lower power consumption, longer battery life, IPX 5-Lifetime Waterproof. 4. SPEAKER UNIT IS EXTERNAL The speaker is near the ear, but it is not in the ear and does not block the ear canal. Listening to the surroundings during a call or listening to music, safer on the go or in some scenes and more portable for companies, work. 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 desired.