Bluetooth A2DP Audio Music Earphone Headset Wireless Receiver Adapter Handy Feature: Compact design Works with the speaker which has 3.5mm line-in jack and play music from Bluetooth A2DP enabled mobile phone and other Bluetooth A2DP audio devices. 3.5mm line-in jack allows you to play other external audio sources, such as MP3, MP4 etc. Specification: Bluetooth specification: Bluetooth V2.0 Bluetooth profiles: A2DP and AVRCP Operating distance: 10 meters Class II Bluetooth frequency range: 2.4GHz-2.4835GHz Rechargeable 250mAH Li-polymer battery Working time: Up to 12 hours Standby time: 230 hours Charging time: About 2.5 hours Charging input: DC 5V/300mA Dimensions: 45338mm Weight: 14g