The Azden's 300 Series are high quality dual and single channel UHF camera-mount wireless systems that feature 188 user-selectable frequencies displayed on an LCD screen to assure you of always finding a free channel.The Azden's 35BT is the standard body-pack transmitter for 300 Series systems, and will work with the 310UDR and 330UPR receivers. It operates on 2 AA batteries and comes with the EX-503L omni-directional lavalier microphone.Features:- 188 Selectable UHF Frequencies- Digital LCD Display w/ Multi-function Readout- Powered by 2 AA Batteries (not included)- Power on/off and au.dio standby switches- Included lavalier mic- Internal microphone level adjustment- Durable metal belt-clip- Freq. Range: UHF 188 Selec. Freq. (566.125-589.875MHz)- Oscillator: PLL Synthesized- RF Power: 25mW- Frequency Response: 50Hz 15kHz- Max. Deviation: 40kHz @ 1kHz Mod., MIC Input 11dBm- Batteries: 2 AA Alkaline (2 x 1.5V) 6-8 hours runtime, 2 AA rechargeable Ni-MH (2 x 1.2V)- Dimension: 2.52W x 3.93H x 1.16D (64 x 100 x 27 mm)- Weight: Approx. 6oz (170g) w/ batteriesWhat's in the box:- 35BT transmitter- EX-503L lapel mic- Attached belt-clip