USB Mouse Key Light is powered by USB. Once you press it, lights will switch "ON". Pressing again two times it will go to sleep mode like changing from full lights to dim lights. Pressing three times, lights switch "OFF".
The USB mouse key light measured 125X92X60 millimeter and weighs for only 135 grams. It is available in Green, Pink, Orange and White color from Gadget4ALL website for only US$19.00