will it work with samsung a12

No, your Samsung A12 doesn't have the wireless charge function.

Does is it work while the cellphone having the phone case?

It works for phone with most cases up to 4mm.

Does it stop charging when phone is fully charged

No it will not. It is COMPLETELY on the phone to halt charging. Chargers are dumb. Phones are smart. Some phones are smarter than others and will halt charging.

Brand	INIU
Manufacturer	Shenzhen Topstar Industry Co.,Ltd.
Model	WI-211
Package Dimensions	12.6 x 10.9 x 7.7 cm; 340 g
Item model number	WI-211
Compatible Devices	For ALL Qi-enabled devices like cellphones [iPhone, Samsung, Google, LG, etc.], Wireless earbuds [Airpods, Google Pixel Buds etc.]
Special Features	Charging Indicator, Fast Charging
Number of items	2
Wattage	15 Watts
Batteries Included	No
Batteries Required	No
Number of Ports	2
Total USB ports	1
Connector Type	wireless
Mounting Type	Tabletop Mount
Does it contain liquid?	No
Includes Rechargeable Battery	No
Manufacturer	Shenzhen Topstar Industry Co.,Ltd.
Item Weight	340 g

INIU Wireless Charger [2 packs], 15W Qi-Certified Fast Wireless Charging Stand with Sleep-Friendly Adaptive Light Compatible with iPhone 12 11 Pro XR XS X Plus Samsung Galaxy S20 Note 20 10 Google etc

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