Batteries NOT included.

System Specifications:

Frequency response: 60Hz-15 KHz+/-3 dB
Audio input connector: 3.5mm mini jack
Audio input level: 600 mV-2000 mV
Power supply: Two AA batteries (up to 8 hours of run-time)
Transmitter/Receiver Dimensions (each): 4.2" x 2.6" x 1.1" (10.6 x 6.7 x 2.9 cm)
Weight (each): 95g (3.4 oz) without batteries
Signal-to-noise ratio: 80 dB
Distortion: 0.8% (-60 dBV, 1 KHz input)
Audio output level: 120 mV
Audio output connectors: 3.5mm and XLR

Lavalier Mic Specifications:

Polar pattern: Omni-directional
Frequency Range: 35Hz ~ 18 KHz
Signal / Noise：74dB SPL
Sensitivity: -30dB +/-3dB / 0dB=1V/Pa, 1 kHz
Connector: 3.5mm locking mini plug
Length: 1.2m (4')