Features:  Wireless transmitter and receiver set for electroacoustic musical instruments like guitar, bass, etc.  Anti-interface and ultra-short delay, giving you the finest music sound.  Foldable body, more convenient for using and bringing.  Built-in rechargeable lithium battery, long working hours, and comes with USB cable for convenient charge.  Plug and play, simple to use. Compact size and lightweight, easy to carry.    Specifications:  Frequency bandwidth: 20Hz-20kHz  Transmission delay: less than 4ms  Transmitter battery: 1 * 3.7V 600mAh rechargeable lithium battery  Receiver battery: 1 * 3.7V 600mAh rechargeable lithium battery  Charge port: micro USB  Item size: 125 * 40 * 25mm / 4.9 * 1.6 * 1.0in  Item weight: 39g / 1.4ounce  Package size: 147 * 106 * 45mm / 5.8 * 4.2 * 1.8in  Package weight: 204g / 7.2ounce    Packing List:  1 * Transmitter  1 * Receiver  1 * USB Cable  1 * User Manual