How to Use: Installation Method: 1. Wall Mounted Installation: The back of the transmitter is equipped with a slide rail mounting plate, first remove the mounting plate. There are two wall plugs and two self tapping screws in the accessories. First, punch two holes with a diameter of 5mm and a depth of ≥30mm on the wall (the hole spacing is 70mm). After inserting the wall plug, fix the slide rail mounting plate on the wall with self tapping screws, and finally slide it into the transmitter. 2. Slide Rail Installation: There is a slide rail mounting plate on the back of the transmitter, remove the mounting plate first. The transmitter slides directly into a standard 35 rail. Specification: Item Type: Temperature Sensor Product Size: Approx. 147 x 88 x 41mm / 5.79 x 3.46 x 1.61in Power Supply Wiring: Wide voltage 10~30V DC power input. Package List: 2 x Screw 2 x Wall Plug 1 x Temperature Sensor 1 x User Manual