Hands-Free Bluetooth Headset: Incoming call announcements and voice-activated answering! These headphones will free up your hands, allowing you to drive with confidence. Powerful Audio Quality & Noise Cancellation: APT-X high-fidelity audio technology, Subb and ADPCM (SB-ADPCM) digital audio compression method, and 16bit/24bit audio support with intelligent noise suppression capability. Ergonomic Headphones Design: Ergonomic ear-hook form, light and skin-friendly material, and soft rubber ear cap It also has a 180° swivel earpiece that can be switched between the left and right ear and the angle may be adjusted. Compatibility and applicability are extensive. Supports all Bluetooth devices and mobile phones, with the ability to connect up to two devices at once. How to Use Adjust the angle of the ear loop to the front and the ear to the back. Put the headset on, the headset is facing the corner of the mouth. Adjust the comfortable angle and wear it. Product Details Color: Black Bluetooth version: CSR8615 Ver. 5.0 Transmission Frequency: 2.4GHz Transmission Distance: 10 m Talk Time: 6~8 hours Standby Time: 120 hours Support File Format: A2DP music player, earphone and hands-free mode Package Content: 1 x Stereo Wireless Business Bluetooth Headphones