Kangnice Mini Handy 2~150mA LED Test Box Tester For Light-emitting Diode Lamp Bulb Handy device for testing LED's. Simply plug your LED into the correct holes (all of which are marked) and push the button to see its brightness, illuminant color, etc. Handy device for testing LED's (2-150mA),Simply plug your LED into the correct holes (all of which are marked) and push the button to test its brightness, illuminant color, etc The top row is for 2 pin LED's with currents ranging from 2mA - 30mA, The bottom row is for 4 pin LED's (piranha LED's) with currents ranging from 20mA - 150mA Powered by a 9V battery (not included),Item size(L*W*H) : Approx. 8 x 5.5 x 2.2cm / 3.15" x 2.16" x 0.87"