Ezylevel is the latest technology in levelling your trailer. Take the guesswork and frustration out leveling, get it right the first time every time without leaving your vehicle! Your eZylevel transmitter is located in your trailer and your eZylevel receiver is placed in your vehicle, now level your trailer to within 1 degree electronically every time. Other great features include: Compact design Easy to read green/red indicator lights Set it once and it will never forget Beep sound indicates caravan is level left/right 4 x AA Batteries included Comes with full operating instructions Makes the perfect gift for every trailer camping enthusiast 12 Month warranty