Audio2000's AWM6951VM VHF Dual Channel Portable Wireless Lavalier Microphone VHF Band, 170-216MHz (Frequency is fixed), Can operate with either 8 AA Batteries (Not included in the Package) or can be plugged into the wall with the 12VDC power supply One 3.5mm TRS earphone output and level control on the front panel & One 3.5mm TRS AUX output on rear panel Two independent balanced XLR output and one mixed unbalanced 1/4" output for your preference of connection Operating Range up to 200ft (within line of sight) Reminder: Although this system can be run on batteries, the battery compartment does not charge the batteries