The Marantz Professional PMD-750T is a beltpack transmitter that operates in the 2.4 GHz frequency range, which is less susceptible to TV and radio interference.Bodypack Transmitter Specs:

• Frequency Response – 50 Hz to 18 kHz
• Audio Quality – 96 kHz / 24-bit, uncompressed
• Input Connector – Mic Input: 4-pin mini-XLR, locking
• Maximum Input Level – 1 Vrms
• Bias Voltage – 5 V (for condenser mics)
• Input Impedance – 10 kOhms
• Power – 2 x AA alkaline batteries
• Dimensions (W x D x H) – 2.6 x 4.0 x 1.6″ / 66.0 x 101.6 x 40.6 mm
• Weight – 2.9 oz / 82.0 g

The beltpack transmitter is powered with two AA batteries.