Golf Rangefinder with Slope and Pin Flagpole Lock Vibration, 1300 yards Range Finder, External Slope Switch, Golf Tournament Legal, Rechargeable Battery, Magnetic Stripe, 7x Magnification How to Use the Rangefinder? Press the power button to turn on the device, aim at the target through the eyepiece, press the power button again to measure, and the measurement result will be displayed on the screen. This rangefinder complies with the USGA rules and can be used in official competitions. 【High-precision Measurement】- This golf range finder has a measuring range of 5-1300 yards with an accuracy of 0.5 yards (yard/meter). It also has a transflective LCD display and a 7x magnification. Rotate the eyepiece to focus on the object and take a quick reading. 【Portable And Easy To Use】- Press One button to measure. Light weight, Mini size, It is very suitable for carrying and measuring when playing golf or hunting. This golf range finder is simply attached to metal objects, such as your clubs or cart, thanks to an included magnetic strip integrated on the right side. 【Slope Switch Off for Tournament Legal】-This rangefinder complies with the USGA rules and can be used in tournament. When the slope switch is off, the ballistic compensation will not be displayed while it still locks the flag and has pulse vibration.