Features: 100% Brand new and high quality! Headset uses the bone conductive speaker so the sound can pass though the skull directly to the auditory center which eliminates many steps of acoustic transmission. It can achieve clear sound reduction in a noisy environment so as to release the ear licate tone function. Stylish ergonomic / Unique design. Will provide better experience for listening than normal bluetooth headset U-shape design easier to fit your head. Suitable for people who jog run cycle etc. Specifications: Bluetooth version: 4.0 Color: Black Frequency range: 100Hz-18KHz Transmission range: 10 meters Transducer Sensitivity: 1003dB Microphone Sensitivity: -503dB Playback Time: up to 5 hours Standby Time: up to 15 days Fully Charging Time: 1.8 hours Package includes: 1* Headphone 1* USB cable