With all the great minds around here, why don't we tap in, sans the snake-oil part? See below... > Outdoors in a sunny clime you may get by with about 2W of PV panel with > MPPT. > Top of hat mounting would be good. May not suit some :-). top-of-hat -> top-hat -> top-up-hat! There. A Top Hat that is a Top-Up-Hat (TM). If one person in 1 million finds that alluring, there's 7,000 potential customers! Add a little vibrating motor to the band to notify the client of incoming messages... activity tracker that gives extra points when one doff's one's hat, gyro analysis for extra points for flourishes when doffing... I'll work the marketing arm and can probably do some hat design. Call me. Lee --=20 http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .