A:AnswerNo, this TV cannot connect with mobile devices via Bluetooth.
Also, you cannot connect computers to the TV via Bluetooth.
You can connect your multimedia devices to the TV using an HDMI cable.
A:AnswerYes, you can connect the TV to your WiFi when needed.
To disable the Alexa feature you must deregister you Amazon Account, this will limit the Fire TV connected experience; you can still connect an Antenna to watch free over-the-air broadcasts from your local channels, a Cable/Satellite Box, Blu-ray/DVD player or gaming console at any time
A:AnswerYes, the TV has a Power/Input button located at the left bottom side.
You can purchase the replacement remote model NS-RCFNA-19
David M. - Insignia Support