Weighing only 2.2 oz without batteries, the UR1M Micro-Bodypack Transmitter is the most compact bodypack available from Shure. It works with headworn, lavalier, and instrument microphones and cables. Its removable antenna provides additional flexibility, and a threaded connector securely locks microphone or instrument cables. Other advanced features include a multi-function bit-mapped LCD, frequency and power lockout and infrared automatic transmitter sync. The UR1 can be used continuously for up to 9 hours using 2 x AAA lithium batteries.