Sennheiser AVX Digital Wireless Microphone System - MKE2 Lavalier Pro 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.Cable Length: 5.25 feet (1.6 m) AVX automatically selects operating frequencies to eliminate interference 2 year warranty when purchased from an authorized Sennheiser dealer