It works with stanard 18650 Li battery, super high intensity, 10 times of traditional 3W portable led light source, so you could use it not just for diagnosis purpose, but also for real opertation, especially ENT, for instance, it will show you very clear image on the mornitor with the help of Stryker camera if you use it for throat operation
Parameters:
POWER: 10W
INTENSITY: 150K Lux 
COLOR TEMPERATURE: 5, 300K
LIFE: 50,000 Hours
WORKING TIME: 2.5 HOURS (real working time depends on the battery capacity)