... to put battery : open the lip of bottom . put the batteries into battery box , pay attention to direction of batter polar ... . corrosion, make battery Decomposed, and lead to trouble.(2) 4c# batteries can be used about 60 days, and you check electricity ... the unit, install 4 pieces “AA” 1.5V high-quality alkaline batteries. (purchase separately)Press the “ON/OFF” button once and the ...