ECM Lav Wireless System L. "The Galaxy ECM Wireless Head Set System includes the ECMR reciever, MBP52 bodypack transmitter, and 52LV lavalier microphone. The ECMR Wireless Receiver The ECMR Wireless Receiver is an economical solution to a great wireless microphone system. The ECMR has 16 selectable channels, IR Sync, Diversity Antennas mounted to the front of the rugged plastic casing. HH52 / MBP52 Wireless Transmitters The ECMR can be used and will sync with either the HH52 or MBP52 transmitters. The HH52 has a gain control and an on/off switch. Both transmitters are powered by 2AA batteries. The MBP52 body pack transmitter has a 0/-10/Mic selector switch. 52LV Lavalier Microphone: The 52LV lapel/lavalier microphone has a unidirectional polar pattern to reduce feedback and a frequency response of 100Hz-16kHz. ECMR Reciever: Audio Output Level: (+/-30KHz deviation, 1KHz tone) XLR connector (into 600 ohm load) -12dBV A1/4"" connector (into 3k ohm load) -18dBV Output Impedance: XLR connector 200Ohms A1/4"" connector 1KOhms XLR output: Impedance balanced Pin1A A1/4Ground (cable shield) Pin2A A1/4Audio Pin3A A1/4No Audio Sensitivity: -93dBm for 30dB Image Rejection: >90dB Dimensions: 1-3/4"" x 9-1/4"" x 4-3/4"" (44.45mm H x 235mm W x 121mm D) Weight: .85 lb. (.39kg) Power Requirements: 13.5 V dc at 300mA, supplied by external power supply. MBP52 Bodypack Transmitter: Max audio input level: 0dBV to +10dBV Gain adjustment range: 20dB Input impedance: 5k ohm Dimensions: 3-5/16"" x 2-5/8"" x 1"" (85mm H x 65mm W x 24mm D) Weight: 3.0oz (85 g) (without batteries) Power requirements: 2 AA batteries (alkaline or rechargeable) Battery life: Approx. 8 hours 52LV Lavalier Microphone: Sensitivity. -64 A+/- 4dB (0dB=1V/UBR 1KHz) Frequency response: 100Hz-16kHz Output impedance: 2k ohm max. (RL-2.2k ohm) Directionality: Unidirectional Working voltage range: 1 10V Standard working voltage: 3V Current consumption 250uA (Max.) Maximum input sound pressure: 110dB SPL S/N ratio: >44dB "