The bulb is made of durable plastic. The key ring made from stainless steel Very bright and beautiful light， When you click the button at the end of the light bulb. The light color will be changed automatically A very cute and fashion item. It IS not just a light. It is also a ornament Color change LED bulb， 7 different colors 3 x AG3 cell batteries needed.(NOT Included) Dimension: 5.5cm x 2.8cm. Material: Acrylic. Bulb design， crashproof， no harm to body Press the top button to turn it on and you will see the flash colorful light Release the button to turn it off light Muti-function， not just a keychain also very convenient to give your light at night Great gift to friends or family Battery replaceable Use For:Car，Living Room / Bed Room/ Study Room /Restaurant Price is for one bulb keychain Package includes: 1x bulb shape keychain