GET THE LOOK:All-aluminum infrared signal 7-key remote control For Hifi audio CD preamplifier TV set-top box The wireless communication of our product is ir.The frequency of our product is 433 mhz.The channel is 1. REASONS TO BUY: Power supply mode: the infrared signal remote control has a built-in power supply, which can be used as a preamplifier to charge your devices. Better protection: preamplifier is designed to protect your infrared signal from overheating, overcurrent, and short circuit. RELATED : Remote control hifi: this infrared remote control can be controlled by a of devices, such as mobile phones, tablets, etc. Colour:D: silver Material:aluminum Package Contents: 1 x remote control Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.