What is the Coreelec compatible TV Box with the lowest Power Consumption?

General
1

I mean a Smart Phone eats less than 1 Watt.
My S905 Boxes all eat 3-5 Watts.
So what is the lowest power eating Coreelec Box?

2

Each watt is about costs about £1.30 /$1.6 per year with 24/7 full usage.