(dual transmitters + one receiver), compatible with smartphones, DSLR cameras, consumer camcorders, PCs, etc. Adopts 2.4G wireless technology, with b anti-interference ability and high performance; up to 50m(164ft) operation range(without obstacle). Omnidirectional lavalier microphone for clear sound recording, suitable for interviews, audio recording, video recording, etc. Standard camera shoe mount and backside clip included, which allows you to mount the transmitter and receiver conveniently. Lightweight and compact for easy carrying, and comes with hard case for convenient storage and carry about. Specifications: RF Modulation: GFSK (Gauss Frequency Shift Keying) Frequency band: 2.4G (2405-2478MHz) Frequency response: 35Hz-14KHz±3dB Signal/Noise: 84dB or more Distortion: 0.05% or less (32ohm, 1 KHz, 65 mW output) FR output level: 3mW Earphone output level: 32hom, 65mW Reception sensitivity: -90dB+/- 3dB / 0dB=1V/Pa, 1KHz Audio input connector: 3.5mm mini jack Operation range: 50m (164 ft)(without obstacle) Power requirement: 2 * AAA battery(not included) Consumption power: Transmitter: 3V/70mA                    Receiver: 3V/70mA Transmitter & Receiver Size: 4.5 * 7 * 3.5cm/ 1.8 * 2.8 * 1.4in Transmitter & Receiver Weight: 47g/ 1.7oz(without battery) Note: The smartphones and stabilizers showed in the picture are not included. Package List: 2 * Transmitter 1 * Receiver 2 * Lapel Microphone 1 * 3.5mm to TRS Audio Output Cable 1 * 3.5mm to TRRS Audio Output Cable 1 * Cold Shoe Mount 1 * Hard Case