The device only has a Bluetooth receiver, but you can connect it to an amplifier using a cinch cable.
Value Stereo Jack - 2x Cinch (1.50m, Entry, Black)
But there is another possibility, you can put this small device in between and it should be able to connect.
I'm not 100% sure if this works with headphones only or also with speakers.
Avantree Priva II - Multipoint Bluetooth Audio Transmitter
The quality of the music is good, but it is really a vintage sound rather narrow and little bass.
The Soundmaster does not allow the connection of external speakers. Even if this were possible, the unit would not be able to make the best use of additional speakers due to the reduced power output.