1 Decoder, 1 Sugar-cube Speaker, 1 set of assorted speaker enclosures.

Hornby quote -

Part of the innovative HM7000 range, the 21-pin Bluetooth® and DCC sound decoder is ready to plug into locomotives featuring a 21-pin (NEM660) socket. The 21pin socket is found in modern Hornby locos, many other locomotives in 00, H0 and some smaller scale locomotives.

The decoder is designed to supply 1000mA continuous load to the main motor and a peak demand of 1500mA, making it highly suitable for most 00 and H0 scale locos.

The decoder also has sound capabilities and comes with a high quality 'sugar-cube' miniature speaker. This is quickly and easily plugged into a socket on the decoder. Download the free HM|DCC app for access to the range of free to download sound profiles.

Also included are assorted speaker enclosures. When installing the speaker inside the locomotive, picking the largest enclosure which will fit inside the loco body will give the best sound reproduction from the speaker.

Download your first set of sounds and install them via the HM7000 app - you can download different sound packs and change those on your decoder later if you wish.