Shelly 2.5 Case - One Channel is a high quality case designed to house and protect your Shelly 2.5 device. The transparent blue color of the case symbolizes Shelly 2.5. This case requires 4 (+1) M3 bolts and M3 "sink ins" for installation. A new feature added in 2021-12-20 is a wall socket ("Halter*"), which makes it even more convenient to install and use.