Aokatec AK-TTL RX Wireless TTL flash trigger RX receiver for Nikon, Canon, Pentax & Sony Modern and traditional Multi-Modes Connection; 4.2 Bluetooth Spec. : ACTions (effective distance: Up to 10meters / 33feet (Smart phone, Pad, Laptop etc). Optical Cable input 3.5mm AUX in RCA input (TV, CD Player, Computer etc). Set it under the television or mount it on the wall for a convenient and elegant set up; With everything you need for a quick and easy setup, upgrading to an amazing home theater experience has never been easier-plug the Sound Bar in, connect it to your TV, sit back and enjoy. Package Included 2 x Wall Mountable Fittings. There is a insulation under the battery, To ensure that not waste electricity before you use. Please remove the Remote battery insulatoin before use. Also Please Put the Battery Under the Buckle, to use this remote normally, Thanks so much for your cooperation.