The wireless system uses 5.8 ghz ensuring the fastest transmission speed, a 24 bit sample rate at 48khz ensures high performance, long range and an excellent battery life. Latency is less than 7 milliseconds. Dare we say impossible to hear latency when it is 0.007 of a second. The wireless system uses a 6.35mm 1/4 inch jack socket and can be used with a wide range of instruments, guitars, violins, keyboards, electric ukulele and many more Both receiver and transmitter can be charged via the supplied USB cable, plugged into a computer USB port, or phone charger, or the 5v UK power supply provided. If the red light flashes after you switch on the transmitter or the receiver, it indicates low battery, please charge it in time with the USB cable. Charged and ready to go, press the connection indicator and the led light goes green, when the units are paired, you are ready to go. Turn the transmitter off to kill transmission, turn it on and the connection is restored.