UPS for Beetel 110 TC1 modem

Messages
1
Location
NA
ISP
airtel
Hi, I just got a new Airtel broadband connection with Beetel 110 TC1 modem (ADSL2+Router) with input 5v DC/1A. I would like to go for a UPS to work uninterruptedly due to power failures. I plan to use the UPS only for the modem. I need a UPS which keep the modem on for 3 hrs. Please someone suggest which capacity of UPS I should go for?
 
I have seen people us Intex, But I have no Idea in the field of UPS's. I luckily have never had power problems..=)
 

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