The BP10 Battery Tray for Pacific Laser System Rotary Lasers is a rugged replacement battery tray that houses four D-cell alkaline batteries (not included). This battery tray is compatible with the PLS H2, HV2R and HV2G rotary laser levels. Weighing only 0.3 pounds, the BP10 has dimensions of 6" L x 3.6" W x 2" H.