Features: Wireless Guitar System Built-in Rechargeable 4 Channels Wireless Guitar Transmitter Receiver for Electric Guitar Bass.  UHF 730MHz 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.  Wireless transmitter & receiver set for electroacoustic musical instruments like guitar, bass, etc.  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.    Specification: 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;  Frequency broadband:20Hz-20kHz;  Charging time:2 hours;  Use time:4 hours;  Colour:black;  Material:ABS;  Size:11x4.5cm;    Package Contents: 1 * Transmitter;  1 * Receiver;  1 * User Manual;  1 * USB Charging Cable