The RL27R Rechargeable Plus Rear Loading 1000 Lumens Tri-Color LED Headlamp is a lightweight headlamp weighing only 4.9 oz. It features a rechargeable battery and a rear loading design. The headlamp has a maximum brightness of 1000 lumens and uses LED lighting technology. The headlamp is compact, measuring 1.72 x 2.46 x 0.93 inches, and uses AAA batteries.