1 Features This is a golf observation instrument that measures distance with precision optics and digital technology, which is a very safe distance testing device, safe without any form of energy emission, no damage or destruction to the human body during the activity of measuring distance. 2 Two functions 1).GREEN MODE (lawn function) This function is specially designed for golfers, you can easily get the distance between your holes. (2).GENERAL MODE(General function) This function is suitable for general situation, first you input the height of the target, then you can measure the distance between you and the target. 3 Parts name 1). Switch/adjustment key 2). Function key 3). Battery cast-in part 4). Peephole 5). Objective lens Main parameters indicators. Objective lens:28mm. Eyepiece:16mm. Resolution: 13″. Magnification: 7 times. Maximum test distance: 930 yards (1 yard = 0.914 m) angle of view: 7.8°. Power supply: the use of two cr2032 button batteries (this product does not contain batteries) volume: 90mm × 50mm × 38mm. 4 Usage 1). Press the switch/adjustment key to make the instrument start, an will go directly to the lawn function. 2). Use in playing golf: The height of the scale in yards (2.6 yards) is already entered. (1) Align the bottom line of the screen with the horizontal line of the lawn. (2) Press the switch/adjustment button to adjust the position of the scan line up to the top of the golf flag pole. (3) The number will appear at the top of the screen, indicating the distance to the hole. (3). Use to measure the distance of special target When you press the function button, the instrument will enter the general function state, the screen will display three digits and one decimal point. If you want to check the distance between you and the target (1) Press the switch/adjustment key to enter the general function status, the screen will display three digits and one decimal point. (2)Press the function key to move to ten digits, then press the switch/adjustment key to enter the number, the range is also 0 to 9. (3) Repeat the above steps to set each digit as well as one digit below the decimal point. (4) Press the function key to end the above input process. (5) Depending on the height you entered, the screen will display the minimum distance you can measure. (6)Align the bottom line of the screen with the lowest line of the target object. (7) Press the switch/adjustment button to move the position of the scan line up to the top of the target object. (8) The number will appear at the top of the screen to indicate the distance between you and the target. Please input its height. 5 Cautions 1). The displayed distance is the same as the height unit already entered. 2). The power is automatically turned off 60 seconds after the operation is finished. 3.) Attention! Please do not use this product to observe the sun with the naked eye, as this will cause damage to the eyes.