Viiart LED Battery Powered Lights With Keychain, Pack of 1 Material: synthetic glass, Bulb keychain size: 2.7cm/1.06" Color: original is clear glass, Battery replaceable Press the top button to turn it on and you will see flash blink colorful light, Release the button to turn it off Muti-function, not just a keychain also very convenient to give your light at dark 1 set, Packed with bubble envelop, shipping time is 10-20 work days