The U3T is a wireless transmitter designed for use with the U3 Microphone Wireless System, and can be used as a replacement or backup unit. Although only one transmitter can be used with a U3R receiver at a time, the receiver can toggle between two transmitter sources by changing from the channel of one to the channel of the other.
TECHNICAL SPECS
WIRELESS TYPE                                    2.4 GHz ISM worldwide open band
BIT DEPTH / SAMPLE RATE                  24-bit / 48 kHz
SWITCHABLE CHANNELS                      6
SIMULTANEOUS CHANNELS                6
MODE                                                  Input: Mic / Line 
FREQUENCY RESPONSE                       20 Hz – 20 kHz (-3dB)
DYNAMIC RANGE                                110 dB (-3 dB)
MICROPHONE COMPATIBILITY            Dynamic and battery-powered condenser microphones
SIGNAL-TO-NOISE RATIO                     110 dB 
TOTAL HARMONIC DISTORTION          0.2%
LATENCY                                              5 ms
OPERATING RANGE                             27.5 m / 90 ft (line-of-sight)
MODE Input: Mic / Line
CONNECTOR XLR (female)
DIMENSIONS 31 x 29 x 98 mm / 3.9" x 1.2" x 1.1"
WEIGHT 93 g / 3.3 oz
MUTE Yes