L-com's HA721xx series 4G/LTE cell boosters and HAKIT-721xxx 4G/LTE cell booster kits are able to capture a weak cellular signal, and amplify it, so you can enjoy crystal-clear calls, fast and consistent data speeds while reducing dropped calls. The HA72170-NF cell booster lets you wirelessly connect over 25 mobile devices and works with 2G, 3G and 4G networks in the US.