Feature:Bluetooth audio receiver with 3.5mm audio plug， upgrade the normal speaker(with 3.5mm AUX IN port) into Bluetooth-enabled speaker， enjoy wireless music freely!Bluetooth 3.0， Support A2DP/HSP/HFP protocol， compatible with for iPhone/iPad/iPod Touch/Mac， Bluetooth-enabled Android smartphone/tablet.Plug and play， no need installation.Built-in rechargeable li-battery， can work about 4 hours after fully charged.Compact size， portable and lightweight.Specifications:Bluetooth version: Bluetooth 3.0Bluetooth profiles: A2DP / HSP / HFPFrequency: 2.4GHz~2.4835GHzEffective range: up to 10mInput voltage: DC 5VCharge time: Approx. 1.5 hoursWork time: Approx. 4 hoursMaterial: ABSItem size: Approx. 4.5 * 3 * 1cm / 1.8 * 1.2 * 0.4inItem weight: Approx. 12g / 0.4ozPackage size: 15.5 * 9.5 * 2.7cm / 6.1 * 3.8 * 1.1inPackage weight: Approx. 48g / 1.7oz?Package List:1 * Bluetooth Audio Receiver1 * USB Charge Cable