Aukey Bluetooth Transmitter/Receiver with S/PDIF | $28 | Amazon | Promo code AUKEY001

External Bluetooth transmitters and receivers with 3.5mm jacks have been around for years, but this model from Aukey raises the bar with support for optical (SPDIF) audio.

The little box can both receive and transmit Bluetooth signals, and includes SPDIF in and out ports to connect it to your TV or high-end audio equipment. Plus, it can even pair to two pairs of headphones simultaneously when transmitting, which would allow two people to, say, listen to the same TV over headphones to avoid waking up someone in the next room. Just be sure to use promo code AUKEY001 at checkout to get it for $28.