Features: Real time monitoring: It can accurately monitoring the battery level, helping users to timely understand the device's usage time and remaining power. Energy saving: It can help users manage their electricity more effectively and avoid sudden power outages caused by depleted power. Extend battery life: Regular monitoring of battery level and proper use of power sources can help extend battery life. Improving portability: Understanding the battery level of the device can help users make timely adjustments or charging, increasing the portability of the device. User friendly: Provides Intuitives battery level display, allowing users to easily understand the battery status of the device, facilitating operation and use. Specifications: Materials: Plastic+Electronic Size:120x65mm/4.72x2.55inch Package Includes: 1PC ATXs Power Supply Tester note: Please allow 1-3mm error due to manual measurement. make sure you not mind before bid. Due to the differences between different monitors, the picture may not reflect the actual of the item.