Twelve South AirFly SE TS-2516 Bluetooth transmitter 3.5mm 20 hr battery

Wireless audio transmitter for 3.5 mm sources

The Twelve South AirFly SE TS-2516 plugs into any standard 3.5 mm headphone jack and streams audio to one pair of Bluetooth headphones or earbuds. It is built for travellers and gym-goers who want to use their own wireless headphones with in-flight entertainment, treadmill consoles, hotel TVs or gaming handhelds. The adapter weighs 0.03 lb and measures 25 in, so it slips into a pocket or carry-on without adding bulk.

Bluetooth 5.2 link with aptX and SBC

The transmitter uses Bluetooth 5.2 and supports aptX and SBC codecs for stable stereo streaming. Pairing is automatic once both devices are in pairing mode, and the connection holds within typical Bluetooth range. Because it is a single-stream transmitter, it cannot send audio to two headsets at once, and it does not receive audio from a phone or act as a receiver for wired headphones. Latency is inherent to the Bluetooth protocol and may be noticeable in rhythm games or video editing.

20-plus hour battery with USB-C pass-through

A full charge delivers over 20 hours of continuous playback, enough for a long-haul flight or several gym sessions. The unit can stay plugged into a USB-C power bank while in use, removing the practical runtime limit for stationary setups. Battery life will fall short of 20 hours at maximum volume or in environments with heavy RF congestion. There is no internal storage, so the adapter cannot play media on its own.