I am searching for a long lasting Bluetooth "cable" which:
- battery lasts at least 8 hours (assume a ~36 ohm in-ear headphone),
- supports for current audio codecs like LDAC, aptX, ...,
- high quality headphone amplifier and,
- bonus, does support Bluetooth Low energy (BLE).
There is for example the RMCE-BT2. I wonder if there are better and cheaper products than this one.