This is a Xadow module which can emit a tone. To drive it, you need to give control to two pins simultaneously: this is different from Grove - Buzzer which uses one pin to control. It is petite but loud! It can be used for making beeps,tones and alerts.
Compatible with Xadow Modules
Sound Pressure Level >70dB
Xadow is a though small but perfectly formed Arduino(TM) compatible board series containing several modules. It's a kit extremely suitable for space-sensitive projects such as wearable devices & arts designs, which have higher request on size, weight and flexible cascade connection.
You can find more modules here
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page for more info about this product. It will be appreciated if you can help us improve the documents, add more demo code or tutorials. For technical support, please post your questions to Seeed Studio'sforum