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. 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. Material: ABS.