Features:  The plug is foldable and unobstructed.Wireless transmitters and receivers can be used for electroacoustic instruments such as guitars, bass, violins, and the like.Ultra-high frequency 730mhz acoustic transmission, anti-interference, ultra-short delay.Supports 4 groups of devices to use at the same time, the maximum transmission range is up to 50 meters.Built-in rechargeable lithium battery, long working hours, with USB cable, easy to charge.Plug and play, easy to use, small size, light weight, easy to carry. This product is suitable for all electric guitars and most acoustic guitars. Since acoustic guitar pickups have many different powers and configurations, there are a small number of acoustic guitars have noise and squeak when using this product.    Specifications: Audio response range:20Hz-20kHz;  Frequency:high frequency 806-809mhz;  Transmission range:max.50m (accessible);  30m (through wall);  Transmission delay:less than 4ms;  Power:Built-in 3.7V 600mah rechargeable lithium;   batteryCharging time:2 hours;  Continuous use time:6 hours;  Charging port:micro USB;  Product size(approx.):8*4*3cm/3.15*1.57*1.18in;  Package weight(approx.):250g;    Package List: 1 * Receiver;  1 * Transmitter;  1 * USB Cable;  1 * Manual (English & Chinese)