Fangrui Product Details [features] With 6 Function Buttons ;program The Button Function By Computer Software. [waterproof] Ip65 Waterproof: It Can Be Used Normally Under Harsh Environment Such As High Oil Pollution, High Humidity And High Dust. Approx 100m Strong Penetrability Without Aiming. [safety] The Remote Controller Is Equipped With A Safety Magnetic Key Switch For Use. The Remote Control Has A Battery Voltage Alarm Device That Automatically Cuts Off The Circuit When The Voltage Is Insufficient. Up/down, East/west, North/south Can Be Programmed To Interlock Or Non-interlock,toggle And Normal Etc. [note] The Remote Control Needs To Be Used With The Contactor. It Cannot Be Directly Connected To A Power Source. Connecting The Power Directly Will Burn The Motherboard. Number Of Function Buttons:6 X One-step Buttons Other Buttons:1 Start Button, 1 Stop Button Protection Class: Ip65 Mitter Power: Less Than Or Equal To 10dbm Power Supply:dc 3v (2xaa Batteries Not Included) Safety Code: 32bits (4.3 Billion)