1.Three Charging Way:For EN-EL20 battery charger built with a double-sided plug USB cable (34.5 cm length) and Type-C port input Power your camera batteries with good charging efficiency.USB port output could as a power bank to charge your phones in an emergency 2.Multi-Function Battery Charger Case:Four-in-one charger is NP-FW50 battery charger, (1) could be used as a camera storage case to store 2 batteries, (2) and is 2 SD card storage cases. (3)have a phone power bank function. (4)Can be used as a card reader to read camera memory card information. 3.Switch button for ENEL20 charger:The switch button has 2 functions, (you need to press the switch once for the output function; when it is used as a storage box, you need to press the button to turn off the power 4.Multiple Protection:The LCD charger case huge your batteries and SD cards firmly while in storage or traveling, keeps dust, debris out of your replacement battery, premium quality charger set with overcharging