This mini light-bulb shaped light creates quite an impact as the LED brilliance is really enhanced through the acrylic bulb. The flashing red light is sure to be an attention getter. Great as a safety light for pets or pedestrians at night. Comes on a keychain attachment. Also would make a great necklace if attached to your own cord or ball chain. Heavy duty acrylic material looks and feels like glass. Uses 3 replaceable AG3 batteries (included). Measures 1.2" width and 2" length.