Lavalier mobile version Suitable for: *Mobile phone recording *Mobile live broadcast *Interview video. Mobile phone, computer, camera (the camera may be slightly noisy)Use time: 3~4 hoursThe empty distance between TX and RX is 20m~30mFrequency: UHF~600MHZ-900MHZM core: capacitive supply current: 0DB Less than 75MA supply: polymer lithium batteryColour:BlackMaterial:ABSSize:18x19x6cmPackage Contents:1* Lavalier microphone1* receiver1* One point two USB charging cable1* Audio conversion plug (for computer)Only the above package content, other products are not included.Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.