A:Answer110 volt - We have been using it for over a month now (my husband uses it frequently) and it has not made any 'noticeable dent/increase in our electric bill.
A:AnswerThis unit receives Bluetooth from other devices, not sure it will transmit Bluetooth. You can order Bluetooth transmitter for headphone jack but it will transmit to headphone only.
A:AnswerYes, I have a Samsung UHD 4k and this home theater system work and sounds great. Just to let you know how much I like it I just got another one.
A:AnswerNot without being creative or buying a special ceiling mount. There are two holes on the rear, one is a keyhole slot for hanging from a screw. I believe the threaded hole below the keyhole is used for a mount. (See attached photo). Nothing in the manual mentions ceiling installation. Only wall. But like I said, there are ceiling mounts you can buy seperately if you just look it up.