Product Description:A8 wireless transmitter and receiver can be used for electro-acoustic musical instruments, such as guitars, basses, violins, etc. High frequency 730mhz original sound transmission, anti-interference, ultra-short delay. Support 4 groups of devices to be used at the same time, with a transmission range of up to 50 meters. Built-in rechargeable lithium battery, long working hours, equipped with USB cable, convenient charging. Simple to use, small size, lightweight and easy to carry. Specification:Audio Response Range: 20Hz-20kHzFrequency: 730mhz High FrequencyTransmission Range: Max. 50m (without barriers); 30m (Through Walls)Transmission Delay: Less than 4msPower Supply: Built-in 3.7V 600mah Rechargeable Lithium Battery Charging Time: 2 HoursContinuous Use Time: 6 HoursCharging Port: Micro USB