Caution!

In some older documents, you will find an outdated specification regarding the voltage for BluBOX power supplies. Some sources (including the text on the BluBOX itself) state a voltage of 9 to 18 volts. The BluBOX can take a maximum of 16 volts, which is why, to be on the safe side, we recommend a power supply with the above specifications (9 to 12 volts, direct current, 300mA, center negative).

If you used your BluBOX with more than 16V input voltage so far and nothing has happened until now, it didn't harm the BluBOX. But to avoid future failures, it is safer to change to a power supply with max. 16 volts.