Denon AVR-X580BT Surround Sound Receiver With Bluetooth Network Audio Player Circuitry with minimized signal paths:

Circuitry with minimized signal paths: With a shorter distance for the signal to travel

coin-cell batteries and you are ready to go

SOUND COUPLING TO THE EAR: Circumaural (around the ear)

How to use it on Amazon fire tv: use an app called app 2 fire on android you can send any app to fire tv then run it so for example google chrome the keyboard works as mouse and keyboard

Auto-Start/-Stop-Function:

Denon AVR-X580BT Surround Sound Receiver With Bluetooth Network Audio Player Circuitry with minimized signal paths:Number of Power amps 5 Power Output (8 ohm, 20 Hz 20 kHz, 0. 08% 2ch Drive) 70W Power Output (8 ohm, 20 Hz 20 kHz, 0. 05% 2ch Drive) Power Output (6 ohm, 1 kHz, 0. 7% 2ch Drive) 90W Power Output (6 ohm, 1 kHz, 10% 1ch Drive) 140W