BOYA BY-WM5 wireless microphone is for use with DSLR cameras and camcorders. The 2.4GHZ GFSK system result in strong anti-interference, good security and stability. Two-way communication, but only sound from transmitter can be recorded. The operation range is 60m without obstacle, 360 degree all-round revolveis workable, the maximum distance can reach up to 80m. You can adjust the volume through VOL+ and VOL- volume control. The lapel clip makes it easy to carry.Specifications:

• RF Modulation: GFSK (Gauss frequency Shift Keying)
• Frequency band: 2.4GHz (2405-2478MHz)
• Frequency response: 35Hz-14KHz±3dB
• Signal/Noise: 76dB or more
• Distortion: 0.1% or less (32Ω,1 KHz,65mW output)
• RF output level: 5 mW
• Earphone output level: 32Ω,65mW
• Reception sensitivity: -85dB +/- 3dB / 0dB=1V/Pa, 1kHz
• Audio input connector: 3.5mm mini jack
• Operation range: 50m (164ft.)
• Power requirements: 3.0V DC (Two LR03/AAA size batteries)

Consumption power:

• Transmitter: 3.3V/110 mA
• Receiver: 3.3V/100 mA

Battery life:

• Transmitter: Approx3.5 hours
• Receiver: Approx4 hours

Dimensions:

• Transmitter: 60mm x 86mm x28mm (W/H/D) (2.36 x 3.3 x 1.1 inches)
• Receiver: 60mm x 86mm x41mm (W/H/D) (2.36 x 3.3 x 1.61 inches)

Weight:

• Transmitter: 136g (4.37oz) (Without battery)
• Receiver: 152g (4.89oz) (Without battery)