Each heater comprises of :-

Pulse Proportional thermostat (not Day/Night).
Ceramic heater
Thermal regulator
Unique safety cut out
All built in one complete unit
Non toxic, stove enameled paint built to the highest specifications
Easy to install
Only simple wiring required i.e. Just plug it in
Easy to install
12 months guarantee

All sizes are approximate.
12" long x 5" wide x 3" deep