Specification: 

*Accuracy: Horizontal 30 arc seconds(+/-1.5mm/10m) 

*Self leveling range: ±5° 

*Operation rang: Dia. 500m (with detector) 

*Laser class:Class II.

*Remote control: Approx.20 m

*Rotate head speed: 0; 300; 600 r. p. m. 

*Operation temperature: -20oC ~ +50oC (-4°F~+122°F) 

*Power supply: DC 4. 8-6V (both 4*AA NI-MH battery and alkaline battery are available ) 

*Working time: Approx. 30hr. 

*Dust and water protection: IP 54 

*Dimension: 190(L)*145(W)*166(H)mm