Princeton Tec Pulsar II Lights. PULSAR II is slightly larger than a quarter and weighing 7 grams, it provides instant illumination by the flick of a switch for any situation and offers easy battery replacement. This compact Ultrabright LED burns with unbelievable intensity making it the perfect choice for key chains, backpacks, book bags, zippers and emergency situations.

• Princeton Tec Pulsar II Lights. PULSAR II is slightly larger than a quarter and weighing 7 grams, it provides instant illumination by the flick of a switch for any situation and offers easy battery replacement. This compact Ultrabright LED burns with unbelievable intensity making it the perfect choice for key chains, backpacks, book bags, zippers and emergency situations.
• Compact, water resistant, and self-contained
• Burn time of 12 hours
• 10 Lumens
• Includes 2 2016 Lithium Coin Cell batteries