This automotive-quality 0.15W speaker is a compact way to add sound to your project. The 100Ω impedance makes it easy to drive this straight from a microcontroller I/O pin.
This small, 0.15W speaker is a compact way to add high-fidelity sound (compared to typical units this size) to your project. The 100Ω impedance makes it possible to drive this straight from most microcontroller I/O pins, and the pins allow the unit to be soldered directly to a PC board.
This speaker was originally designed for automotive applications (e.g. for the chimes cars make when the headlights are left on). This means the speaker is engineered to operate over a wide temperature range of -40°C to 85°C.
Specifications:
Instructions
Rated input power: 0.15 W
Maximum input power: 0.3 W
Impedance: 100 Ohm
Size: 30D x 12.8H mm
Frequency response curve for the 16mm speaker.

16mm speaker dimensions (in mm).