Main Features:Highly Flexible Headband: Made of high toughness PC material with soft PU leather cover, the headband is foldable and flexible.Soft Earpads: On ear design with soft memory sponge fillings ensure long time wearing comfort.Ultra-long Standby: Up to 1100 hours long standby, can listen music or talk for 25 hours continuously.Hi-Fi 24bit HD Sound Decoding chip: Built-in 24bit HD chip, brings you real Hi-Fi surround sound.Bluetooth 4.1 chip: Adopts latest Bluetooth chip, transmitting data at high speed and bring you smooth music experience. And its low power ensures long lasting battery life, which can be up to 5 hour continuous music time. Also it works well with most smartphones for iPhone / HTC / Motorola / LG / Samsung Simple and stylish: The design is quite simple and stylish. 2 colors for your choice: Black and white for your choice. The white one have colorful geometric figures and black one have white random letter for decoration. Show your own style.Clear calls: Adopts acoustic echo cancellation for calls, a technology which can help to cancel echo and bring you clear calls. Also, you will never miss a call when you're enjoying music.Support Line-in Music: Play music from MP3 player, smartphone or other audio devices via double-head 3.5mm aux-in cable. Brand: Bluedio Model: A Color: Black,White Wearing type : Headband Function: Bluetooth,Microphone,Voice control,Answering Phone,Song Switching,Noise Cancelling,HiFi Headset type: Dynamic Connectivity : Wireless Connecting interface : Micro USB Application: Mobile phone,Computer,Portable Media Player Driver unit: 57mm Frequency response: 15Hz~25KHz Impedance: 32ohms Sensitivity: 110dB Talk time: 25 hours Music Time: 25 hours Standby time: 1100 hours Bluetooth: Yes Bluetooth version: V4.1 Bluetooth distance: W/O obstacles 10m Bluetooth band: 2.4GHz - 2.48GHz Bluetooth protocol: A2DP,HSP,HFP Package weight: 1.423 kg Product size (L x W x H): 19.20 x 17.20 x 7.50 cm / 7.56 x 6.77 x 2.95 inches Package size (L x W x H): 24.00 x 23.00 x 11.00 cm / 9.45 x 9.06 x 4.33 inches Package Contents: 1 x Bluetooth Headset, 1 x Audio Cable, 1 x USB Charging Cable, 1 x Engslish User Manual