Wireless transmitter and receiver can be used for electroacoustic instruments such as guitar, bass, violin and so on. Features: The speed is quick, the anti-interference ability is strong, and the transmission performance is more stable. The 270 rotatable plug can cope with various position and angle sockets, which is more convenient to use. The LED display shows the current frequency band, volume and current battery level. It can be used for a variety of electroacoustic instruments such as electric blowpipe, electric guitar, acoustic guitar, bass, electric violin, mixer, etc. One transmitter, can support multiple devices to receive, the transmission range can reach more than 30 meters. Built-in rechargeable lithium battery, long working hours, equipped with USB cable, charge more convenient. Specifications: Color: black, red (optional) Power: 75mA Frequency range: 636MHz-799.5MHz Battery: 3.7V, 500mAh Transmitter/Receiver size: 100 * 60mm / 3.9 * 2.4in Package size: 200 * 100 * 50mm / 7.9 * 3.9 * 2.0in Package weight: 200g / 7.1ounce Packing List: 1 * Transmitter 1 * Receiver 1 * USB Cable 1 * User Manual Note: Please shut down the machine in time after use. If it shuts down automatically, it will cause low voltage, resulting in failure to charge.