This is a Ktec Class 2 Transformer AC Adaptor with the model number KA12A100120044U.
Input: 120V AC, 60Hz, 17VA.
Output: 10V AC, 1200mA, 12VA.
Safety: It is UL listed (E216698) and designed for indoor use only.
Compatibility: This type of adapter is commonly used for various electronics, including fountain pumps and holiday lighting