... and SOS function Strong Compatibility For iPhone Charger with Indicator Power Bank Advantages:1. USB output, heavy support ... overtime, overheat, overcurrent, short-circuit3. Charge & discharge battery indicator function, easy to use4. Lighting and SOS function 5. ... overtime, overheat, overcurrent, short-circuit3. Charge & discharge battery indicator function, easy to use4. Lighting and SOS function 5. ...