1. Conversion time: The conversion time of UPS refers to the time required from the interruption of the main power supply to the UPS taking over the power supply. Generally speaking, the shorter the conversion time, the better, as this means that UPS can provide power to the computer faster, thereby reducing the possibility of data loss and computer damage. Most UPS conversion times are in the millisecond range, typically 4-10 milliseconds.

2. Battery life: The battery life of UPS depends on multiple factors, including frequency of use, charging method, and battery quality. Generally speaking, the battery life of UPS is between 2-5 years. It is necessary to regularly check the battery status and be prepared to replace the battery.

3. Load capacity: The load capacity of UPS refers to the current load it can supply. Different models and brands of UPS have different load capacities, so when purchasing UPS, it is necessary to choose the appropriate load capacity based on the power requirements of the computer. The load capacity is usually expressed in units of VA (volt ampere) or W (watt).

4. Alarm and protection functions of UPS: Some UPS systems have alarm and protection functions, such as overload protection, battery low voltage protection, and overheating protection. When UPS detects an abnormal situation, it will trigger an alarm and perform corresponding protective actions to protect the safety of the computer and UPS itself.

Now, you have learned how to connect and use a computer UPS uninterruptible power supply, as well as some related issues. By properly connecting and using UPS, you can protect your computer and data security in the event of power outages or interruptions.