Nextivity Cel-Fi QUATRA 4000 & 4000i is an Active DAS Hybrid that solves the problem of poor cellular coverage in middleprise buildings. It can enhance reception of all major service provider mobile networks in USA, simultaneously. Cel-Fi QUATRA 4000 and 4000i systems deliver a cellular signal that is up to a 1000 times stronger, utilizing CAT 5e cabling for RF and Power over Ethernet (PoE). Cel-Fi QUATRA 4000 can be installed in just days, and at a price point that meets the middleprise budget. Cel-FI QUATRA 4000 is carrier grade, carrier approved and guaranteed to be network safe for all major wireless carriers including AT&T, Verizon, Sprint and T-Mobile.