Is this TV good for a bedroom?

Yes. At 40 inches and 1080p it fits a bedroom or dorm well, and the Roku interface keeps streaming simple. It is not bright enough to fight strong daylight, so a dimmer room suits it best.

Does it support 4K or HDR?

No. The panel is 1080p Full HD with no HDR, so it is a step below TCL's 4-Series 4K models. For a small screen at normal viewing distance the difference is modest.

The TV, a Roku remote, a stand and power cable. Check the listing for the exact remote type, since some versions ship with a simple IR remote rather than a voice remote.

Can I use it for gaming?

It works for casual console play, but the 60Hz panel and lack of game-focused features make it a poor fit for competitive gaming. A budget 4K set with low input lag is a better choice there.

Does it have enough ports?

It has three HDMI inputs, plus USB and an antenna/cable input. That covers a console, a streaming stick and a soundbar without a switcher.

How does it compare with TCL's 4-Series?

The 4-Series adds 4K resolution, HDR and better picture processing at larger sizes. This 40-inch set is the simpler, smaller option for a secondary room.