Two Ultrabright LEDs, the Bot is built with the same ruggedness and reliability as the rest of the Prince-ton Tec headlamps. Durable plastics, a single arm bracket, and large push button make the Bot sturdy and simple to operate. The battery compartment on the Bot screws shut to ensure that the batteries won’t be accidentally accessed. An auto timer turns the light off after 2.5 hours of inactivity – the Bot rounds out The Family in a big way. Power- 15 Lumens, Max Burn Time- 9 Hrs., Batteries- 2 AAA Alkaline or Lithium, 64g.