The size of the Powerpack is approx. 21 x 10 x 13.5 mm. An alternative version can be found here: https://www.ebay.co.uk/itm/284173654320

A real Powerpack (not to be confused with Stayalive) has never been so cheap! Almost half the price of its competitors, but all the same features. Made by the up and coming manufacturer Train-O-Matic in their own factory in Romania. Train-O-Matic is a brand name to watch, for their affordable, but full featured high quality products.
The Train-O-Matic PowerPack has to be connected to any decoders that has a PowerPack connection and reliably supplies your locomotive with several SECONDS of energy when driving over dirt spots and long routes.
The sound as well as the light and motor functions are buffered and thus ensure that your models can continue to drive for up to 4 seconds without electricity (depending on the power consumption of the locomotive).
The Powerpack has an integrated charging circuit and is controlled by the decoder. It can therefore remain in the locomotive while programming (this is not always the case with Stayalives). The beginning of the charging current can be programmed to prevent excessive loading of your booster if several models are in use.
The buffer time can be limited by means of programming a CV on the decoder so that a red signal also leads to an exact stop.
In contrast to Stayalives, which are more simple storage capacitors, the SPP memory module provides several seconds of additional power.
A 3-pin cable (supplied with this Powerpack) connection is required between the decoder and the power pack.
The energy of the memory module is only requested if the SPP circuit detects that the track contact has been broken incorrectly, but also e.g. when the locomotive drives into a de-energized stop section or is taken off the track.
Please note that the Powerpack automatically switches off in analog mode for technical reasons: buffering is therefore not possible in analog mode.
Only works in conjunction with a digital decoder with a Powerpack / USP / SPP (etc.) connection.
Compatible with:
LokPilot V4.0 family, LokSound V4.0 family, LokPilot 5 family and LokSound 5 family
Lenz Gold Decoder (USP connection)
All Train-O-Matic decoders (Lokommander II)
Sold by
Sven van der Hart
Tramfabriek
Eton Wick, UK