Paring function： Paring function can fix it when the receiver and the transmitter can not be connected and dysfunction can be resolved due to equipment or system abnormalities . Paring method： just press the key , you can do use it immediately. Note: Do not put the product into the damp environment; when the laser brightness becomes dark, replace the battery or charge it. In dry battery model, remove the battery to prevent leakage of electricity when not use for while. Alkaline battery is for better laser function. Safety warning：Do not point the laser beam at the eye or the light-sensitive device to prevent injury or accident; Do not use the product for any illegal use. Product parameters：Battery requirement: Lithium battery type: Built-in lithium battery Light source: Red Laser Wavelength: 532 nm / 650 nm Laser type: 3R class laser Wireless Type: RF Technology 2.4G (360 ° Control) Wireless distance, up to 20meters USB receiver : Support Android 2.0 and higher version) Operation system:WindowsXP、Vista/Win7、Mac Work environment: - 10℃～45℃
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