Ask HN: Vibrating band or bracelet for android device

I am looking for a band or bracelet like device that can be worn on my hand and paired with my android mobile (Moto X). I just saw a device by Alcatel named Boomband at http://www.engadget.com/products/alcatel-onetouch/boomband/

I often keep my device silent and cannot feel or hear it vibrate if I am not near the device. Plus when I am out, the ringtone is often drowned by the surrounding noise. The only similar device I found was Fitbit Charge and seems too over-priced.

So I am looking for a reasonably priced durable device with good battery life.