size, 4cmL*2.5cmW * 2cmH, red with red light, green w/ green light, blue w/ blue light & white w/ white light, finger ring lamp. Description, 1) Item ... W * 2cm H.3) Red color w/ red LED, Green color w/ green LED, White color w/ white LED, Blue color w ... / blue LED.4) Let your fingers light the way.Packing, 4pcs ...