Sennheiser XSW 1-ME3-A Wireless headset system great for gyms, churches, schools (548-572 MHz)

Receivers

• Dimensions - approx. 200 x 42 x 127 mm
• Weight - approx. 340g
• Power supply - 12 V DC nom. / 300 mA
• AF frequency response - 50 to 16,000 Hz (–3 dB)

Transmitter

• Dimensions - approx. 71 x 96 x 28 mm
• Weight - approx. 95g
• Microphone - condenser
• THD, total harmonic distortion - ≤ 0.9%
• Pick-up pattern - cardioid
• Signal-to-noise ratio - ≥ 103 dBA
• RF output power - 10 mW
• Switching bandwidth - up to 24 MHz
• Operating time - approx. 10 hrs
• Modulation - wideband FM
• Output voltage - 1/4“ (6.3 mm) jack socket (unbalanced): +6 dBu, XLR socket (balanced): +12 dBu
• Power supply - 2 AA size batteries, 1.5 V
• Adjustment Range Transmitter - 0 to -30 dB, adjustable in 10 dB steps
• Output voltage - '1/4“ (6.3 mm) jack socket (unbalanced): +6 dBu, XLR socket (balanced): +12 dBu
• Housing -rugged ABS housing
• Frequency - 8 frequency banks, each with up to 10 factory-preset channels
• Frequency range -  A: 548-572 MHz, GB: 606-630 MHz B: 614-638 MHz, C: 766-790 MHz D: 794-806 MHz E: 821-832 MHz, 863-865 MHz K: 925-937.5 MHz
• Sensitivity - < 3 μV at 52 dB(A)rms S/N
• SPL for peak deviation - 150 dB
• Squelch - adjustable from 3 dBμV to 28 dBμV (combined with pilot tone)
• Adjustment Range Transmitter - 0 to -30 dB, adjustable in 10 dB steps
• Synchronization - 2.4 GHz, Low Power OQPSK (only active during synchronization)
• Input sensitivity - 1.5 mV / Pa
• Audio adjustment range - 45 dB, adjustable in 5-dB steps
• Line / Mic level - 20 dB, switchable
• Temperature Range - operation: 0°C to +40°C, storage: –20°C to +70°C
• Receiver Principle - double superheterodyne
• Diversity principle - Antenna switching diversity via internal antennas