High-capacity lithium battery--one is divided into two charging cables to charge 2 transmitters at the same time, which greatly reduces the charging time. It only takes 2 hours to fully charge the device and can work for 6 hours. Stable signal transmission - the transmission distance reaches 164ft (50 meters). 20 UHF channels are optional, free from signal interference, frequency band 902-928MHz. High quality sound--- The condenser microphone core, so that the sound reproduction of the instrument can reach 99%. Lightweight, Plug and Play -- the transmitter is lightweight at only 2.4 ounces. Simple installation, automatic signal synchronization connection, plug and play. 2 Transmitters with 1 Receiver - can be used by two flutists at the same time, or can be exchanged when one person works long hours.