Description: : headphones work through vibration, and the sound is transmitted to your cochlea through the via bone. Compared with ordinary headphones, hearing damage can be avoided. 5.0: The conduction headset features the transmission distance up to 20m, lower power consumption, faster transmission speed. CVC Smart noise reduction technology, it delivers crystal clear HiFi sound in music or call, even in complicated environment. Application: best choice for people who like to exercise outdoors such as running, hiking, bicycling, also for people who wear headphones all day that need to protect hearing. The band loops behind the head, close to the neck, so the size accommodates most customers. Support TF Card: Support TF Card (not including)The headset is resistant to sweat, making exercises more freely. Lightweight, comfortable to wear without stress. Long Battery Life: 300mAh large capacity battery, the headset features up to 12 hours of music/talk time, 150 hours standby time and only 2 hours of Type C charging time. Specification: version: V5.0+EDR Wireless frequency: 2.4GHZ Supported protocols: A2DP1.3/HFP1.6/HSP1.2/AVRCP1.6/D11.3 Transmission distance: 20 meters no barrier Battery capacity: 300mAh Charging voltage/current: 5V/1A Charging Time: 2h Speaker impedance: φ10mm 32Ω Microphone sensitivity: -42Db Size Chart: Material: Plastic Size:Overall length 33cm/12.99inch Headphone head width 7mm/0.28inch Package Includes: 1 Piece Headphone 1 Piece USB Cable 1 Piece Manual Note: Please allow slightly 0-1cm difference due to manual measurement. Colors can appear different depending on light and how the listing is viewed. Thanks for your understanding and attention. Wish you a pleasant shopping experience!