does it have an ac power supply?

No. This charger does not include an AC wall power adapter. It is powered via a USB 5V power source, such as a USB wall adapter, power bank, laptop, or USB port. A USB charging cable is included.

Questions & Answers: Kastar Quadruple Battery Charger Compatible with Sony NP-BG1, NP-FG1, G Type Battery, Sony BC-CSG, BC-CSGD, BC-CSGE Charger, Sony DSC-W230, DSC-W270, DSC-W275, DSC-W290, DSC-W300 Camera

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Kastar
Item#: 9SIAAWYJUR2582
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Kastar Quadruple Battery Charger Compatible with Sony NP-BG1, NP-FG1, G Type Battery, Sony BC-CSG, BC-CSGD, BC-CSGE Charger, Sony DSC-W230, DSC-W270, DSC-W275, DSC-W290, DSC-W300 Camera

Can charge 4 batteries at the same time; Can change the plate to charge different batteries.
The Charger Input: 5V 2-3A 15W; Output: 4.2V 800mA (x1 or 2) 500mA (x3 or 4).
The Intelligent Compact charger displays charging status and battery capacity.
Multiple charging option, Micro-USB input and Type-C input, come with a Type-C cable.

$16^.49 –