Plug and play, easy to use, compact size, lightweight, and portable. Built-in rechargeable lithium battery for long working time; includes USB cable for convenient charging. Supports up to 4 groups of devices used simultaneously, with a maximum transmission range of up to 50 meters in open space. Ultra-high frequency 730MHz original sound transmission with anti-interference performance and ultra-low latency. Wireless transmitters and receivers compatible with electro-acoustic musical instruments such as guitars, basses, violins, etc. Specifications: Audio frequency response range: 20Hz - 20kHz Transmission range: up to 50m (open space); 30m (through walls) Transmission delay: less than 4ms Power supply: Built-in 3.7V 600mAh rechargeable lithium battery Charging time: approximately 2 hours Continuous usage time: up to 4 hours Charging port: USB Dimensions: 11 x 4.5 x 1.5 cm (4.3 x 1.8 x 0.6 inches) Material: ABS Color: Black Package Contents: 1 x Guitar transmitter 1 x Guitar receiver 1 x Power cable Note: The package includes only the items listed above. Other accessories are not included. Lighting and display differences may cause slight color variations between the product image and the actual item. Measurement error is allowed within +/- 1-3 cm.