Plug and play, easy to use, small in size, light in weight and easy to carry. Built-in rechargeable lithium battery, long working time, equipped with USB cable, easy to charge Support 4 groups of devices to be used at the same time, the maximum transmission range can reach 50 meters Ultra-high frequency 730mhz original sound transmission, anti-interference, ultra-short delay. Wireless transmitters and receivers can be used for electro-acoustic musical instruments such as guitars, basses, violin, etc. parameter: Audio response range: 20Hz-20kHz Transmission range: max.50m (-free); 30m (through walls) Transmission delay: less than 4ms Power supply: Built-in 3.7V 600mah rechargeable lithium battery Charging time: 2 hours Continuous use time: 4 hours Charging port: USB size:11x4.5x1.5cm / 4.3x1.8x0.6 inch Material:ABS colour:black Package Contents: 1 * Guitar transmitter 1 * Guitar receiver 1 * power cable Only the above package content, other products are not included. Note: Light 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.