A totally revolutionary idea in lavalier wireless, the AL1 is an all-in-one miniaturized presentation transmitter with a built-in electret condenser microphone! Tiny, the AL1 still has all Power and Mute switches, an Input Level control and a two-function red LED that indicates when the transmitter is on and transmitting signal. Highly flexible, the AL1 lets yo use the transmitter's built-in unidirectional electret condenser mic or plug your favorite lavalier mic into the mini input jack. Phantom power is provided for condenser microphones. An alligator clip allows the AL1 to be mounted on a lapel, pocket or belt. Or you can use the convenient lanyard to wear it around your neck. Featuring the ability to operate on a triple-A battery with 14-hour battery life, AirLine transmitters provide exceptional wireless reception over long ranges. And UHF (Ultra High Frequency) means your wireless system is operating on a clearer frequency band with less interference.Borrowed from our UHF Series One Systems, the UR1 diversity receiver gives you reception you can always depend on. It features 1/4" unbalanced and XLR (mic/line switchable) balanced output jacks, Power switch, Peak LED, Diversity AB LEDs, RF Level Meter LEDs along with Squelch and a Volume controls. You can mount one or two UR1s in a single rackspace with Samson's DR2 Rackmount adaptor.