MPOW Brand Certified: Top-Brand Bluetooth Accessories for Smartphones. Magical Function: Change Non-bluetooth speakers into bluetooth-enabled.Play music wirelessly from your Bluetooth-capable smartphone， iPod Touch， iPhone， iPad， Android. Great Hardware: Bluetooth 4.0 and apt-X tech ensure stable signal and hight-fidelity stereo sound. And Latest NFC function allow tap-and-pair and tap-and-connect the receiver with NFC-equipped Android， Windows 8 and Nokia phones Compatible with most speakers: Plug the receiver into any A/V receiver， stereo system， or speaker through standard RCA or 3.5 mm jack. Superior wireless performance; Transmit up to 30 feet away with line of sight. ( Note: 1/Need to provide charging when using it. 2/There is Protective film on its surface which look like scratches， Pls Rip it off when receiving )