Britelink Bluetooth Audio Receiver: Portable, Bluetooth Music Receiver with Stereo Output _3.5 mm_ for Home and Auto Stereo S

Upgrade existing speaker or stereo system with Bluetooth technology!Works with the speaker or home/car stereo system which has 3.5mm line-in jack and play music from Bluetooth A2DP enabled mobile phone and other Bluetooth A2DP audio devices.Auto shut off function: (here is how you use it, not a design fault! 1. The device will NOT auto shut off when paired with mobile device (either with or without power plug in). 2. The device will auto shut off when NOT paired and idle for 5 min. (This is to preserve battery power when in idle mode). 3. After plug in the power, device will be shut off. But you can press the power button around 5 second (when plug in) to turn it back on again. This design is for long term use without the need for recharging.Specifications:-- Bluetooth specification: Bluetooth V2.1, A2DP and AVRCP -- Bluetooth frequency range: 2.4GHz-2.4835GHz-- Operating distance: 10 meters Class?-- 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: 45?33?8mm-- Weight: 14g