This is a small 12mm round speaker that operates around the audible 2kHz range. You can use these speakers to create simple music or user interfaces. Each speaker is PTH solderable and requires an operating voltage of 3.5-5V with a mean current of 35mA max.
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Our Code: AUD-50007
Supplier Link: [SparkFun MPN:7950]
At a small 12mm this round speaker make sound at the audible 2kHz range (similar to speech). Sound output is around 95 dB which is like 9500000000 mosquitos in your bedroom!
The speaker works from 3.5V to 5V and has a max current of 35mA. Coil resistance is 42 ±6.3 ohms.
To make sound it must be driven with a square wave. Fortunately this is just what most microcontrollers will send out a PWM output.