Objective lens: 28mm; Eyepiece: 16mm; Resolution: 13″; Magnification: 7x; Maximum test distance: 930 yards (1 yard = 0.914 meters) Angle of view: 7.8°; Power supply: Use two cr2032 button batteries Volume: 90mm×50mm×38mm; Instructions 1. Press the power switch/adjustment button to start the instrument, and it will directly enter the ping function. 2. When used for playing golf: The height of the scale in yards (2.6 yards) is already input. (1) Align the screen line with the horizontal line of the ping. (2) Press the power switch/adjustment button to adjust the position of the scanning line upward to the top of the golf club. (3) The number is displayed at the top of the screen to remind you of the distance to the hole. 3. Used to measure the distance to special targets When the function button is pressed, the instrument enters the general operating state, and the screen displays a three-digit number and a decimal point. If you want to check the distance between you and the target object, enter its height. (1) Press the power switch/adjustment button to enter the general operating state, and the screen displays a three-digit number and a decimal point. (2) Press the function button to move to the tens digit, and then press the power switch/adjustment button to enter the digit, the range is also 0 to 9. (3) Repeat the above steps to set each digit and decimal point. (4) Press the function button to finish the above input process. (5) Depending on the height you entered, the screen displays the distance you can measure. (6) Align the line on the screen with the line on the target object. (7) Press the power switch/adjustment button to adjust the position of the scanning line upward to the top of the target object. (8) A number appears at the top of the screen to indicate the distance between you and the target object.