The 1Mii ML300 is the best portable Bluetooth transmitter. It offers everything in a portable Bluetooth transmitter:
10-hour battery life
A rechargeable lithium-ion battery lets you enjoy up to 10 hours of wireless streaming
support for the aptX Low Latency Bluetooth codec
When used the aptX Low Latency codec, the latency measured a much more acceptable 29 ms, just under the 31.4 ms average.
the ability to pair to two sets of headphones at once
It Supports aptX Low Latency and aptX HD when pairing two headphones as well, but it is not recommended to connect two headsets that support aptX HD at the same time.
Easily pair to your TV, home stereo, computer, and other devices with a standard 3.5mm audio input/output - just plug in and sync your devices.
With a compact size
The ML300 is small and light enough for you to carry it to the gym or while traveling, and it comes with everything you need to connect to your audio source.