Wireless transmitter & receiver set for electroacoustic musical instruments like guitar, bass, etc.  UHF 730MHz original sound transmission, anti-interface and ultra-short delay, giving you the best music sound.  Supports 4 sets of devices working at same time, one-to-one; and max. transmission range is up to 50 meters.  Built-in rechargeable lithium battery, long working hours; and comes with USB cable for convenient charging.  Plug and play, simple to use; compact size and lightweight, easy to carry.  Color: black  Material: ABS  o Response Range: 20Hz-20kHz  Frequency: UHF 730MHz  Transmission Range: Max.50M (No obstacle); 30M (through-wall)  Transmission Delay: Less Than 4ms  Power Supply: Built-in 3.7V 600mAh rechargeable lithium battery  Charge Port: Micro-USB  Item Size: 11 * 4.5 * 1.5cm / 4.3 * 1.8 * 0.6 inch  Package Contents:  1 * Transmitter  1 * Receiver  1 * User Manual  1 * USB Charging Cable  Only the above package content, other products are not included.  Note: Light shooting 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.