One-touch mute; the transmitter supports a one-touch mute function; which allows the Interpreter to temporarily mute the microphone without turning off the transmitter; this is useful in situations where a Interpreter needs to have a private conversation or with a break to quickly pause the audio transmission. Longer transmission distance; working range up to 150m/492ft in open area; receivers do not have to be clustered around the transmitter; useful information can be heard clearly. Humanized design; one-button pairing can complete the pairing with multiple receivers in a short time; press the button to add and subtract channel; save your precious time and improve efficiency. Crystal clear sound; the sound quality of the audio tour devices is of high clarity; the transmitter has the ability to reduce surrounding noise; delivering a processed output sound that can reach a 16K effect; this ensures that the transmitted audio is clear and easily understandable to the listeners. Built-in rechargeable battery; both receiver and transmitter have 3000mAh battery; transmitter works for 18h; receiver used for about 80-100h; large-capacity battery saves customers from having to charge frequently.