Timer - 24 hour Mechanical Timer 24 hour mechanical timer built into side panelThe dial is divided into 24 segments for the 24 hours.Each hour has 4 tappets (each equates to 15 mins)The over-ride button can be used to over-ride the heat demand from the set timer position.The thermostatic control knob can be used to set the desired comfort level.Detailed operator instructions can be downloaded from Installation & Instruction ManualRadio Frequency EnabledThe thermostatic control knob can be used to set the desired comfort level.Radio Frequency Control Option Wireless (433MHz) , installed in minutes.Up to 7 radiators can be controller from 1 controller.Seven day programmable with up to six temperature changes per day.The day program can be overridden by: Holiday, Boost , Advance , Set Back or Quick Adjust.Precision electronic thermostat, accurate to 1 oC, with a 0.1 oC resolution.Temp display in oC or oF (selectable)Clock display in 12 or 24 hour (selectable)Operates on two AA alkaline batterie (supplied)Battery life at least a year.Warns when batteries are low.If you replace the batteries the only thing you have to reset is the time ,as all the programs are held in memory.Wall mounted.Size 130mm length x 97 mm width x 20 mm depth.Colour white Detailed operator instructions can be downloaded from Radio Frequency Controller Manual