Call attention to your brand with this Light 'N Whistle Key Tag! Simply press a button to activate the red LED. Great for personal safety, this keychain also features a whistle for added safety when out at night. Uses 2 button cell batteries (type AG3) included and inserted with battery blocker (replaceable only with mini screwdriver). Offered in several translucent color choices, customize this 2.5" x 1" safety key light with your company logo and hand them out for your next marketing campaign!