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     Audio 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     Item Weight: 35g / 1.2oz (for each)     Note:     The guitar and guitar amplifier showed in the picture are not included.     Package List:     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.