The 'PSIcle' sensor is a battery free aftermarket accessory for bike riders that will enable them to keep a closer eye on the tire pressure of their ride to avoid issues when riding. The tire pressure sensor works by being installed at the valve stem and will go to work relaying information to the rider's smartphone when the bike isn't in motion and their smartphone is held within range. The lack of a battery makes the pressure sensor far easier to use as it won't require replacement or maintenance to continue being used.
The 'PSIcle' sensor maintains a compact design frame that can be easily integrated onto any kind bike and won't get in the way of riding. The device comes in two models for road bikes and mountain bikes alike.
Source: Michael Hemsworth