Meet the ClickStick: a smart electric deodorant applicator that delivers the right amount of deodorant every time. It has a companion app that lets you customize your ClickStick and order refills. The device has a button that applies deodorant when the device is at your armpit. You can use the app to get more info on the amount of deodorant you need based on your activity level.
ClickStick is a refillable product, so it is environment-friendly. ClickStick comes with pink, blue or green lighting. Its deodorants come in various strengths and scents. This interesting project on Kickstarter right now.