Mini Portable Bluetooth Receiver with Built-in Rechargeable Power Supply Makes Virtually Any Speaker System Wireless and Bluetooth Ready (White) By ISound Easily convert almost any speaker system, home stereo, or car stereo with either a 3.5mm audio jack or RCA jacksinto a wireless Bluetooth device. Fully tested and certified with advanced Bluetooth technology and a 6 device memory  for easy connect after simple paring. Always ready - built in rechargeable lithium battery for up to 10 hours of continuous use  receiver can be switched off when not in use to conserve power. Compact attractive design  1.6 X 1.6 X .75 makes this easy to fit into virtually any system. Up to 33 foot wireless range allows the user to control their playlist, volume and stop/play through their device in comfort without having to approach the speaker system.