Free Sentinel Hat*
Send us your green tips and if Gutenbird uses them, we'll send you an official Sentinel Hat.
Our official adjustable sports cap with the Sentinel Logo on front, Gutenbird with thumbs up on side, and Sentinel's founding year, 1858, in yellow on back.
Email Gutenbird your tip to MrG@lisentinel.com. Make sure to include where to mail your hat. (Sorry: No PO Boxes. Available only in the US. 1 hat per person. *Hats sent when your tip is used.)
You can check out tips at http://sentinelinnovation.com/Tip