When using the Pro OX®-100B Oxygen Monitor for MORE than two (2) continuous hours be sure to turn the power switch to the OFF position. If battery is installed, remove from the housing. Then connect the standalone power supply/charger cable to the port. After this step, connect the power supply/charger plug into the nearest working outlet (110V for US type/220V for EU type). Then simply turn the power switch to the ON position. The Pro OX-100B is capable of operating indefinitely with a standalone power supply.

CAUTION: ALWAYS REMOVE THE BATTERY IF USING THE MONITOR FOR MORE THAN 2 CONTINOUS HOURS. FAILURE TO DO SO CAN OVERHEAT THE BATTERY AND SERIOUSLY DAMAGE THE PRODUCT AS WELL AS VOID THE WARRANTY.