The Audio-Technica ATW-T210BI wireless UniPak body-pack transmitter has both low- and high-impedance input connections along with a DC bias voltage connection for use with dynamic and electret condenser microphones as well as Hi-Z instrument pickups. Separate input trim controls are provided for each input along with a ten-position channel selector switch. All adjustment controls are hidden behind the transmitter's battery door and an adjustment tool is provided with the transmitter. A locking 4-pin HRS-type input connector is provided for both inputs. The connector is recessed to protect the connection and input cable. Sophisticated Tone Lock tone squelch eliminates the need for a separate mute button allowing the two-position, positive-action mechanical switch to function for both power and mute. The switch is located on the top of the transmitter for easy access and can be operated without looking at the transmitter. An RF power select switch offers high and low settings. A battery condition indicator shows that the batteries are good. The transmitter operates on two standard AA batteries (sold seperately) providing over eight hours of continuous operation. Constructed of rugged high-impact materials, the transmitter incorporates a latching captive battery door, field replaceable antenna and reversible belt clip.