The UV lamp on the end equipment is recharged with a USB plug that simply plug into a computer or other device with a USB port and plugged in. LEDs indicate the remaining battery filling level (and therefore the UV lamp) on the side.
This UV lamp is handy when you have, like me, cats at home that sometimes urinate rightly or wrong ... in a big house, one can thus identify areas where cats urinated and would have dried. By cons, a better use of the UV lamp in the background to maximize the ground reference, even if the light is sometimes distinguished footsteps.
In short, a handy tool in this last use.
