Portable UHF Wireless Guitar Transmitter and Receiver Set 50M Transmission Range Built-in Rechargeable Lithium Battery for Bass Electric Guitar Violin Features: Wireless transmitter & receiver set fits for electroacoustic instruments, such as guitar, bass, violin and so on. UHF uncompressed sound signal transmission, the wireless transmitter & receiver set features anti-interference and ultra-short delay. Support 4 sets of devices working at same time, the maximum transmission range is 50 meters. Built-in rechargeable 600mAh lithium battery, long working time; package comes with USB cable, convenient to charge. Plug and play for easy operation, small in size and light in weight for portability. Rotatable plug, available for instruments with input jack in different positions. Specifications: Frequency Response: UHF Latency: less than 4ms Charging Port: Micro USB Charging Time: 2h Battery Life: 4h Power Supply: Built-in Rechargeable Lithium Battery (3.7V/ 600mAh) Transmission Range: Max. 50m (open field)                                   Max. 30m (through-wall) Item Size: 12.8 * 4.3 * 1.5cm / 5 * 1.69 * 0.59in (for each) Item Weight: 38g / 1.34oz (for each) Package Size: 18.3 * 8.4 * 5cm / 7.2 * 3.31 * 1.97in Package Weight: 235g / 8.29oz Notes: The guitars showed in the picture are not included. When using, do not make it faces the speaker, and keep the distance between 1.5 meters to prevent whistle. When using, if the speaker whistle, try to turn the sound box down. Package List: 1 * Receiver 1 * Transmitter 1 * USB Cable 1 * Manual (English & Chinese)