The STACO2 is designed to equip a model with a Next-18 interface and power storage. A Next-18 decoder can then be plugged into the STACO2 as an adapter board, which then outputs the decoder connections via 13 soldered wires.

STACO2A StayAlive controller with Next18 interface
1 x STACO2, 14x10.4x1.9 mm, for controlled charging and discharging of 2 mini goldcaps, 13 soldered. stranded wires
2x Mini-Goldcaps 0.3 F/2.7 V, 4 x 12 mm (diameter x length)

STACO2B StayAlive controller with Next18 interface
1 x STACO2, 14x10.4x1.9 mm, for controlled charging and discharging of 2 mini goldcaps, 13 soldered. stranded wires
2x Mini-Goldcap 1 F/2.7 V, 6.4 x 9.8 mm (diameter x length)

The difference between the STACO variants:
STACO1: 10 x 7.3 x 1.7 mm
STACO2: 14 x 10.4 x 1.9 mm
STACO3: 10 x 7.3 x 2 mm
variants A and B refer to the enclosed capacitors only.
A: 0.3 F / 2.7 V
B: 1 F / 2.7 V