Sony are releasing special Hatsune Miku versions of their Walkman S devices to commemorate the Vocaloid’s fifth anniversary. The Miku-version Walkman models come in blue, black and a second blue model that has external speakers.

Here’s a closer look at the front and back:

Each Walkman will come with the song “Hoshi no Kakera” pre-installed on it, and Sony are only producing 3,939 units in total. Why that number? Because in Japanese, that’s a wordplay on one pronunciation of 39—“miku”.

They’ll be available on Sony’s online store in mid-August. The blue and black models will cost 12,800 yen ($163) and the model with speakers will cost 15,800 yen ($201).