The AKG Perception HT 45 Handheld Wireless Transmitter is a wireless handheld microphone transmitter designed for wireless vocal applications such as presentations, vocal performances and more. The HT 45 is lightweight and features a 3-way on/off/mute switch. Simply power up the microphone transmitter and the Perception SR 45 receiver (sold separately), choose between one of the 8 available UHF frequencies, and you’re ready for wireless vocals. The Perception HT 45 is powered with a single AA battery for up to 8 hours.