Features: -Strong light mode switch button, more accurate accuracy, higher construction quality. -Three buttons simple mode of operation, more peace of mind, use more quickly. -110-220V power supply charge, you can also charge side with. -Rotary power switch, ieasy to operate. Specifications: Color: Yellow. Materials: Engineering plastics. Size: 125 x 125 x 90mm. Supply Voltage: 4.2V. Lithium Battery: 3.7V. Accuracy: 40'. Leveling Time: 4-5s. Operating Temperature: -10℃~40℃. Storage Temperature: -10℃~50℃. Power Supply: AA x 3 (Does not include batteries). Instructions: Press the V light once, press H once V off; press V once V1 light, then press V2 once, then press V1, V2 full off; over range alarm all laser tube 1S off 0.5S flashing. Package Included: 1 x Infrared Laser Projection Instrument. 1 x Base. 1 x Glasses. 1 x Cloth. 1 x AC Power (Distribute the adapter according to your country). 1 x Power Cable. 1 x Accessories. 1 x Box Strap. 1 x Box