about this item:

BOYA BY-WM3D Digital True-Wireless Microphone System for iOS Devices, Cameras, Smartphones (2.4 GHz)

the BOYA BY-WM3D is an easy-to-use, digital true-wireless microphone system designed to capture clear, intelligible speech to your iPhone/iPad, DSLR/mirrorless camera, or any smartphone/tablet equipped with a headphone jack.

• For Video, Vlogging, YouTube, Instagram:
• Miniature Transmitter with Built-In Mic:
• Plug-In Receiver for iOS/DSLRs/Phones:
• 4.5 Hours on Rechargeable Batteries: