AirLine AH9 Fitness Transmitter Headset Transmitter with Qe Microphone With its micro design, the AH9 transmitter mounts directly to the included Qe headset, eliminating belt packs and cables from the setup (ideal for active performers). In addition to a 300' operating range, the AH9 features easy-access gain and mute controls, a low-battery LED indicator, and an 8-hour rechargeable lithium-ion battery. Features / Specs Micro transmitter mounted directly to a double ear headset (no beltpack or cable required) Water/sweat-resistant Qe headset microphone with condenser capsule Up to eight hours of battery life using built-in rechargeable lithium-ion battery Sealed gold contact charging connector Low battery LED indicator 300' operating range (line-of-sight) Variable Gain control One-touch Mute Windscreen included Specifications Input Gain Range 20dB RF Power 10mW EIRP Power Requirements 3.6V 500mAh Lithium Ion rechargeable battery Battery Life 8 hours Dimensions 5.9" x 6.7" x 3.9" / 150mm x 170mm x 100mm Weight 0.13lb / 60g