The Hornby R7403 19V Power Supply Adapter allows you to use an existing 19V power supply with the HM7000 system. This adapter is compatible with P9000, P9001, P9002, P9003 (19V-0.5A transformers) and also, P9200, P9201, P9202, P9203 (15V-1.2A transformers). The HM7000 system is an innovative way of controlling and operating model railways, combining Bluetooth technology and app-based control to revolutionize the hobby. It is compatible with 00 gauge train sets. Hornby has been a leading model railway designer for over 100 years, specializing in 00 Gauge model railway design since 1920.