Mega Phase LED Finger Lights (Set of 4). This 4 pack of Mega Phase LED Finger Lights uses multiple color-changing LEDs that automatically cycle through various pattern speeds, alternating from a slow "mood" pattern that fades between colors to a super quick strobe phase that flashes between each color. The different color casings also makes the LEDs light up uniquely. Each Finger Beam utilizes an elastic strap to fit all size fingers. Each Finger Beam uses 3 long-lasting replaceable AG3 batteries (included and installed). This toy is 100% raver approved, so bring it with you to the next big party. Many people use finger lights in their routines but i bet you will be the only one with multi-color phasing finger lights! So toss those single color finger lights to your kid brother and get these ones!