REMOVU RM-M1+A1 Wireless Microphone and Receiver for GoPro HERO4, HERO3+ & HERO3 This device fits GoPro HERO3, HERO3 plus and HERO4 only. NOT for HERO 5 and later models. Maximum distance is about 40 Yards depending on environment Powered by included Lithium battery, and runs more than 6 hours Fits perfectly into standard GoPro BacPac housing, thus no additional investment is required if you already have BacPac housing What's Included: M1 Mic, A1 Receiver,A1 USB Connector (attached to A1 receiver on opposite side of power switch), a USB Charging cable, Waterproof housing for M1 Mic, Wind guard for M1 Mic, Clip and Connector for GoPro mounts, , User manual