1、MAIN PURPOSE: Small uninterruptible power supply for power outages, with battery backup mode to ensure that your device can still use the network in the event of a power outage.  2、WIDE APPLICATION: This portable uninterruptible power supply is compatible with most router, modem, security camera, cell phone, fax machine, fingerprint recorder, DSL, and more.  3、2 INPUT METHODS: This mini UPS has 2 input methods, 9V or 12V DC adapter (faster) or 5V 2A USB (slower), with a maximum output power of 18W, which is efficient and practical.  4、BUILT IN BATTERY: This uninterruptible power supply has built in batteries with 8800mAh capacity, providing longer endurance, standard USB port, which can be used as a regular power bank.  5、CIRCUIT PROTECTION: This compact UPS has short circuit protection, voltage fluctuation protection, overcharging protection, over discharge protection, and temperature protection to ensure safe operation.