This product uses ultra-high frequency 700Hz original sound transmission, which is anti-interference and has ultra-low latency. It supports simultaneous use of up to five devices and has a maximum transmission range of 30 meters. It has a built-in rechargeable lithium battery for long operating time and comes with a universal Android USB cable for convenient charging. It is plug-and-play, easy to use, and compact and for portability. Specifications: Frequency Range: 620-700MHz Transmission Delay at 30m: Less than 5ms Power Supply: Built-in 5V 600mAh rechargeable lithium battery Material: ABS plastic + copper + electronics Size: 110 x 45 x 15mm Standard Electric Guitar Port, Universal Android Data Cable Port Color: Black Package Contents: 1 * Transmitter 1 * Receiver 1 * USB Charging Cable 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.