Sennheiser AVX Digital Wireless Microphone System - ME2 Lavalier and AVX42 Handheld Transmitter with MD42 Capsule Combo Set Ultra compact AVX receiver plugs directly into the XLR audio input. AVX switches on and off automatically with the camera using P48 Phantom Power. AVX automatically sets input sensitivity for optimum recording levels. AVX automatically selects operating frequencies to eliminate interference, RF frequency ranges 1,880 to 1,930 MHz 2 year warranty when purchased from an authorized Sennheiser dealer