Charger for removable batteries. Fits up to two 18650 batteries at once. LED indicator for charging status. Green LED indicates battery is fully charged or charger slot not being used. Red LED indicates battery is still charging. Output is 4.2V Input is 5V Charges at approximately 1A rate Uses a USB port plug in, you will need an adapter to plug into a wall outlet.
Polarity is indicated on the charger for positive and negative ends.