16 MHz Ceramic Resonator, in a 3-lead standard package.
Resonators used to be the poor cousin of crystal oscillators.... Oh heck, they're still not quite as good (temperature stability isn't as good), but for most applications, they're quite useful, and inexpensive. They're a great way to clock your microcontroller (especially Arduino!)
|Features||Built in Capacitor|
|Package / Case||Radial - 3 Lead|