BOYA BY-WM5 wireless microphone

-BOYA BY-WM5 wireless microphone is for use with DSLR cameras, 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-14KHz3dBSignal/Noise: 76dB or moreDistortion: 0.1% or less (32,1 KHz,65mW output)RF output level: 5 mWEarphone output level: 32,65mWReception sensitivity: -85dB +/- 3dB / 0dB=1V/Pa, 1kHzAudio input connector: 3.5mm mini jackOperation range: 50m (164ft.)Power requirements: 3.0V DC (Two LR03/AAA size batteries)Consumption power: Transmitter: 3.3V/110 mA Receiver: 3.3V/100 mABattery life: Transmitter: Approx. 3.5 hours Receiver: Approx. 4 hoursDimensions: 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