BOYA by-WM4 Pro 2.4G Wireless Microphone System(Dual Transmitters + One Receiver) with Hard Case Compatible with DSLR Camera Camcorder Smartphone.

The mic plugs into the lightweight bodypack transmitter, which runs on two AAA batteries. The clip-on lavalier microphone features an omnidirectional pickup pattern that helps to deliver consistent audio levels even when the subject turns away form the mic.