It has a push-button on/off switch which is now located close to the tribrach body to prevent it from accidentally turning on during transport or handling.

Uses a standard 3-volt CR2 lithium battery providing 10 hours of continuous operation.

Laser Tribrach

PN: 2153-02-BLK 

• Bright 650-nm focused laser dot
• Circular vial w/ 8-minute sensitivity
• Standard three-prong forced centering with center lines
• Included is a standard 3 volt CR2 lithium battery
• Weighs 1.65 lb (0.75 kg)