Having taken the hurdle of connection - a TAE plug does not exist, only a RJ11 for which you still need in most cases an adapter - the phone is already operational. Batteries or a power supply are not required.
However, the processing is unfortunately poor. The hinge is shaky and does not act very reassuring. The voice quality is reminiscent of a tin can. Neither the volume of the speaker (which seems to be designed for heavily hearing impaired) or the ring tone can be changed and the key is initially a slightly strange smell.
The cable is unfortunately not interchangeable.
All in all acts processing extremely cheap.
The only real plus point is the funny appearance, which is certainly good for a laugh already. (And at least one has to concede that thing - appearance really does not bad.)
Otherwise you get for little money already much better and higher-quality phones.
Considering that it is a nice idea and work at least passably, there are 2 stars from me. Due to the poor quality but is no longer there.