The GT-402T is a hand held transmitter microphone includes rechargeble batteries. The circuitry uses a high stability PLL synthesised UHF transmitter designed for use on licensed free UHF FM 863-865 MHz frequencies (subject to local licensing laws). It has 16 programmed preset switchable channels. GT-402T is supplied with NiMh rechargeable batteries typically allowing 10 hours usage on a single full charge (16 hours on a typical non recharge alkaline battery). Operating range in free air (open field) 100 Metres. Has a detachable module for to allow dynamic or Condenser microphone capsule to be used.