Feature:1. Uneven wheel weight distribution will cause the car to sway more in one direction than others. In this circumstance, the car will run unstable, difficult to control!2. Helps RC drivers easily measure and view the RC car's corner weight distribution through the App. With the accuracy of 1g, RC drivers can precisely adjust their car's weight at each corner to the best balance to win the race.3. This conner weighting system is empowered by the latest BT 5.0 chip, which results in faster and more stable connection. When connected with the phone, the last century segment LED as the predecessor is enhanced the intuitive display in full screen!4. Smart weighing system is small and portable in size. It can accurately measure the weight distribution at the racing car's four corners. So RC racer can quickly adjust the weight at each corner to the best balance effect and win the race.5. The native emphasis on the ultra low power consumption of BT 5.0 and our proprietary protocol get a CR2450 lithium coin battery to deliver the long lasting, dependable performance of continuous 30 hours.Specification:Specification: Item: RCSmart ScaleMain Material: ABSRated Voltage: 2.6V-3.6VRated Current: <10mA@DC3VBattery: CR2450 3V Lithium Coin BatteryMaximum Weight of Each Scale: 2000gTolerance: 0.1g / 0.1ozResolution: 0.1g / 0.01ozSize: 68*68*22.5mmNet Weight of Each Scale: 70g.Package List:4* RC Smart Scale1* User Manual