This is very convenient when recording audio with two or more people. There are four transmitters, so you can record audio from up to four people simultaneously. The power turns on automatically when taken out of the case, and charging starts when returned to the case. It's a beautiful item, only used once for testing. Of course, there are no operational problems. Four wind muffs, two cables, and one charging cable are included. Please understand that no claims and no returns are accepted. The charging case can store four batteries and can be charged via a USB-C port. - Brand: COMICA - Accessory Type: Charging Case - Quantity: 4 - Charging Port: USB-C - LED Indicator: Yes Thank you for viewing.