Focusing: eyepiece focusingMeasure theory: semi-conductor laser, no harm to eyesMeasure distance: 20m-1000mMeasure speed: <300km/hMeasure tolerance: +/-1 m; +/- 0.2% +/- 5 km/hReading: LCDSize: 121x127x58 mmWeight: 472gBattery: 1x6F22 (9V)Tripod screw: 1/4"Modes: standard, >100m, speed three modes Reticule: 3 kinds changeableMemory function: last 10 readings recallBasic speed measure: for objective moving backward or forwarder