Know when you should cast your next spell using your Harry Potter clock. Products supplied in association with Harry Potter Desk Clock $19.95 Reading the time becomes a magical event with this Harry Potter Desk Clock. When the alarm goes off light appears and music plays. This clock measures approximately 4.25 x 6.25 x 2.5 inches. 2 AA batteries required (not included). This page created and maintained by www.jarusa.com. © www.jarusa.com 1999-2005.