Heat Mat 4" x 5"
Reptitherm Heat Mat spec as follows

Size - 4" x 5"

Wattage - 3 w

Suitable for small vivariums , spiders etc.

Use the correct size of mat for your vivarium - as a guide in a warm house a heat mat which is one third to half the floor area will provide enough background heat into the vivarium for most lizards, tortoises etc.