NotiSysinfo Lite is a small system monitoring background service available for Android devices. It allows you to keep an eye on your device's RAM, storage, and battery usage by displaying the system information as a notification in the notification drawer. This is particularly useful as you can check this information without starting any application.

The notification is customizable and can display RAM information (total, free, used), two configurable storage information panels (e.g. internal storage and SD card), and battery info (battery level, temperature, voltage). You can also customize the color of the usage bars.

Please note that this is the Lite version of NotiSysinfo, and if you want more features and customization, you can upgrade to the Pro version. The Pro version offers a CPU information panel (usage, frequency per cores), customizable collapsed view, customizable notification icon, RAM free or used percentage, CPU usage percentage, storage free or used percentage, battery level, 10 different bar colors, and over 30 different background colors and styles for your SysInfo notification.

Overall, NotiSysinfo Lite is a useful tool for monitoring your device's system information, and the Pro version offers even more features for those who need them.