The Mevo is weatherproof only when properly mounted on the Boost accessory. The weatherproof flap on the back protects the ethernet port and USB ports when closed.
When used properly with the Boost accessory, Mevo has an IPX4 rating for outdoor rain operation. This is designed to be left outside for all of your recording or streaming needs, rain or shine.
While the Mevo and Boost accessory can handle outdoor weather conditions, they are not waterproof. You should never submerge either unit underwater.