Brand new and never used. Comes with support stands, USB cable extra earbuds and instruction manual in Chinese. Authentic from Kuwo. Black headset. Power supply: Built-in rechargeable battery Function: Microphone, Answering Phone, Bluetooth, Listening to Music. Frequency response: 20-20KHz Impedance: 16ohms Sensitivity: 110dB Working time: 7 hours Standby time: As long as 336 hours Charging time: 1-2 hours Highlight: Smart Magnet Switch "turn on/off" High quality polymer lithium battery Smart to open and close the bluetooth headset, when two headset separate, headset automatically shuts down whereby if both headsets cohere it automatically opens. Any inquiries kindly private message.