I see a ProLink 1200VA 720W for sale on Lazada for P5500 (P1k shipping). Does this sound about right for the price? Can this product, or another quality/reliable brand, be sourced locally cheaper? A couple other questions before I drop nearly P7k: How long would one of these keep a modem and wifi running if they were the only things plugged into it? If you are familiar with this brand does it do that annoying beeping sound when the power goes out? (Every UPS we had in the military did this when the generators went out. It was very annoying to have 4+ of these things beeping out of sync in the office.) If anyone has FilProducts does the internet stay on during brownouts if power is supplied to the modem?