Features: Transform your non-Bluetooth Headphone into Wireless Headphone.Small size, easy to carry and play.Lightweight, suitable for most type of peoples.Built-in Micorphone and Volume control.Compatible for Bose OE2 OE2i QC25 audio headphone.Also can fit for other 2.5mm jack Headphones.Descriptions:Voltage: 5VBluetooth Version: V4.1Battry Capacity: 120mAhBluetooth Distance: 10meterWorking Time: 8-10hoursAudio Performance: SBC,MP3,AAC,StereoSupport Bluetooth: HFP v1.6, HSP v1.2, A2DP v1.3, AVRCP v1.5,SPP v1.2Specifications: Earphone cable length:15cmUSB cable length: 25cmSize: 55x12mmColor: blackMaterial: PlasticUsage:Boot: Long press the answer key to boot, until hear the starting up prompt tone (voice prompt boot), then the blue light flashing.Shutdown: Long press the answer key to turn it off (voice prompt to turn it off).Battery Charging: When charging, the indicator light turns red, the blue light turns means full charge.VOL+: Long press the VOL+ key to increase the volume.VOL-: Long press the VOL- key to turn down the volume.Switch to the previous song: Short press the Vol+ key turn to the previous song.Switch to the next song: Short press the VOL- key turn to the next song.Music play: Short press the answer key.Music pause: Short press the answer key.Answer/hang up the phone: Short press the answer key.Redial: press twice the answer key can redial the last time calling phone number.Package Included: 1 x Bluetooth Wireless Adapter1 x CableNotes: Due to the difference between different monitors, the picture may not reflect the actual color of the item. We guarantee the style is the same as shown in the pictures.