Amazon unveiled its Echo Buttons at a big hardware event earlier this year, promising that the hockey puck-shaped buzzers would be ready in time for trivia games at Christmas. Amazon is now opening preorders for the Echo Buttons, available in the US in a two-pack for $19.99. The buttons will ship around December 19th, just in time for the holidays.

Each Echo Button will connect to an Echo device via Bluetooth to play single-player or multiplayer trivia games. Amazon is providing a number of games at launch, including music trivia, sound effect games, basketball trivia, and a football quiz. The Echo Buttons illuminate and can be used as buzzers to answer the questions that Alexa reads aloud. Amazon’s Echo Buttons are the first “Alexa Gadgets,” and more hardware accessories are planned for the future.