Distance measuring range: 4-600m. Angle measuring range:0~+/-90 degree. Distance measuring method: Semiconductor laser ranging (harmless to the human eye). Range error: ±1m±0.1%. Angle measuring error: + / - 0.25 °. Ranging display mode: see in the LCD display.The effective diameter of the objective: 24 mm. Coating: multi-layer coating. An exit pupil diameter: 3.8 mm. An exit pupil distance: 12 mm. Focus: the eyepiece lens. Telescope ratio: 6X. In view of the 1000m: 122m. Ranging model: RAIN; RELF; > 150; Standard mode power supply: CR - 2 (3V) battery.