We miniaturized some some of the basic circuitry of SMTcylon and came up with BlinkyBall.  Just 14mm square.  It’s a motion activated ball, multi color, with 4 integrated programs: short, medium, long, and sleep. Drives cates nuts!

BlinkyBall is just 5$ as a kit, or 7$ assembled.  Each comes with a battery.  Spare batteries are CR1221 and available at your local drug store, or here 5/2$.  Due to current TSA rules, batteries must be shipped by ground.

SMTblinkyBall Kit $5ea/w battery:

SMTblinkyBall Assembled $7ea/w battery:

CR1221 Batteries $2/5:

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Blinky Surface Mount