Welcome to my shop, I wish you have a happy shopping. Product Feature: 180 degrees rotating design, suit for left and right ear. bluetooth V5.1 chip,stable singal transmission. Bluetooth transmissi more→on distance: 10 meters. Creative hook design and only 10g weight,stable and comfortable. Support adjust volume and change music Material: plastic shell Battery capacity of the headset: 150mAh Noise Reduction: CVC 8.0 Working voltage: 3.7V Charging voltage: DC5V Charging Time: about 1 hours Talking time: about 25 hours Music time: about 20 hours Frequency response: 20 - 22kHz Products include 1 * Bluetooth headsets 1 * Charging cable 1 * User Manual Thank you and look forward to your next