Nightstick Rechargeable Full-Size Long Gun Light Kit 1500 Lumens Black. 5 hrs Switch Function: Momentary or constant-on Length: 5.5 in (140 mm) Width: 0.9 in (23 mm) Weight: 7.5 oz (213 g) Diameter: 0.9 in (23 mm) Head Diameter: 1.5 in (38 mm) Light Source: LED Body Color: Black Quantity of Batteries: 1 Power Source: Rechargeable Lithium-Ion Battery Max Input: 12VDC 0.5A Backup Power Source: (2) CR123 batteries (not included) Specifications for Nightstick Rechargeable Full-Size Long Gun Light Kit: Manufacturer: Nightstick Light Output: 1500 lumens Bulb Type: LED Battery Type: Lithium CR123 Beam Color: White Color: Black Gun Model: M4 AR-15 Length: 5.5 in Weight: 7.5 oz Weather Resistance: Waterproof Finish: Type III Hard Coat Anodized Gun Type: Rifle Mount Type: Picatinny Light Source: LED Attachment Type: Picatinny Features of Nightstick Rechargeable Full-Size Long Gun Light Kit LED technology;Features both tail cap and 6in Remote Pressure Switches Momentary or constant-on function Standard and offset Picatinny rail mounts Sharp focused beam for distance illumination Aircraft-grade 6061-T6 aluminum housing w/Type III hard-anodized finish Beam distance rated at 300 meters IP-X7 Waterproof Impact and chemical resistant Serialized for personal identification (2) CR123 batteries (included) Limited Lifetime Warranty Package Contents: Nightstick Rechargeable Full-Size Long Gun Light Kit Nightstick LGL-170: Rechargeable Full-Size Long Gun Light Kit 1500 Lumens Black