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 mission range can reach 50 meters Ultra-high frequency 730mhz original sound mission, anti-interference, ultra-short delay. Wireless mitters and receivers can be used for electro-acoustic musical inst ents such as guitars, basses, violin, etc.<br><br>parameter: Audio response range: 20Hz-20kHz mission range: max.50m (barrier-free); 30m (through walls) mission 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<br><br>Package Contents: 1 * Guitar mitter 1 * Guitar receiver 1 * power cable<br><br>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.