Like new 2. 4GHz Transmitting Technology--BOYABY-WM3U is a 2.4GHz wireless mic system with an innovative design featuring a built-in microphone on the transmitter. Includes Type C, 3.5mm TRS Adapter - Compatible with most Android Type-C Smartphones, Tablets, Windows / Mac PCs, iPad Pro, Macbook Pro, DSLR, Camcorders, Recorders, etc. CHARGING CASE INCLUDED--The BOYABY-WM3U storage box also serves as a charger for the transmitter and receiver. After the storage box is fully charged, the transmitter and receiver can be fully charged up to twice, allowing the transmitter/receiver to operate for approximately 4.5 hours/8 hours after each maximum charge. SMALL & POWERFUL DESIGN - With its small yet powerful features, the BY-WM3U is perfect for everyday vlogging, live streaming, and interviews, significantly improving the recording quality on your smartphone, PC, or DSLR. 1 Year Boya Warranty