--Objective Lens (mm): 21 --Prism: Bak4 Roof Prism --Focus System: Eyepiece Lens --Lens Coating:Full Muti Coating --Exit Pupil: 3.8mm --Eyerelief: 12mm --Field of View: at 1000 m 122m --Distance measured: 15 m to 1200 m-- --Accuracy Normal condition: +/- 1 m +/- 0.1% --Display: LCD Indicator --Power Source: 3V CR2 battary X1(no include) --Dimensions: 95x75x40mm --Weight: 200g --Measurement Pattern: Semiconductor laser measurement(harmless for eyes)