PWR-LINE How it works The PWR-LINE is a replacement power adapter for your microUSB powered MikroTik router. It’s compatible with all the latest microUSB powered devices made by MikroTik, a simple software upgrade to v6.44+ enables this feature (supported by the mentioned devices with serial numbers that ends with /9xx and /0xx. PWR-LINE functionality is also supported by some of previously manufactured units - if you have unit with serial number that ends with /8xx , upgrade to 6.