Tiny and Lightweight: About the size of a quarter, adds no bulk to keychain with convenient quick release ring, weighs 0.2 ounces which adds no bulk to keychain. Two Modes: Press the Squeeze Button activates instant light, slide On/Off Switch for hands free operation. Ultra-Bright LED: Unbreakable flashlight offers 12 lumens brightness and 100,000 hours LED life. Visible over one mile Replaceable Battery: The installed 2 x CR2016 lithium battery gives you up to 12 hours of continuous use. Make Great Gifts: Perfect for Halloween, Christmas, Outdoor Night Party, Camping, Hiking, Dog Light, or Emergency.