☀Emitter: 1x 5050 LED
☀Battery options: Not includes
☀Battery support: 21700/18650 rechargeable lithium-ion battery
☀Dimension: 153mm-169mm (length) × 39mm (head diameter)
☀PK11-B Weight: 155 grams (without battery)
☀Reverse polarity protection to protect against improper battery installation.Advanced Temperature Regulation (ATR) technology: As the temperature rises(above 55℃), Natfire pk11 is programmed to automatically step down and step up the brightness to prevent over-heating.