Rechargeable Built-in UHF Wireless Guitar System Transmitter Receiver,Wireless transmitter & receiver set for electroacoustic musical instruments like guitar, bass, etc.Uhf 730mhz sound transmission, anti-interface and ultra-short delay, giving you the best music sound.Supports 4 sets of devices that work at the same time, one-to-one; and maximum transmission range is up to 50 meters.Built-in rechargeable lithium battery, long hours of work; and comes with usb cable for convenient charging.Plug and play, simple to use; compact and lightweight size, easy to carry.Audio response range: 20Hz-20KHzFrequency: 730mhz ultrahigh frequencyTransmission range: max.50m (without obstacle); 30m (through the wall)Transmission delay: less than 4msPower supply: built-in 3.7v 600mah rechargeable lithium batteryCharging port: -usbColour:BlackMaterial:plasticSize:11 x 4.5 x 1.5cmPackage Contents:4 * Transmitter4 * Receiver4 * USB Charging Cable(random color,The specified color is not accepted)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.