No, there is no AC adapter in the box. The reasons are:
1. It is recommended to power the Avantree TV Transmitter from your TV USB, so it will be on / off with TV easily;
2. Most people have many AC adapters from cellphone and others. For environmentally friendly consideration, we will not include an un-necessary accessory.
3. FREE AC adapters can be provided upon request within first 30 days of purchase for product over 50 dollars.
The compatible power adapter needs to be with output of 5V 500mA - 2A.