At the core of the BEST SHELTER system is a gateway that sends signals to each door lock to initiate lockdown. Plugged into a battery backup (not included) or UPS, the SHELTER gateway doesn’t require an Internet connection to initiate lockdown. This alleviates any concerns that your network must be operational during the most critical times. With a 400-foot range,* the gateway can be paired with up to eight repeaters to extend the signal range throughout a building. Most unique of all, with assistance from your integration resource, the SHELTER repeater can be configured to send a relay signal to your pre-installed access control system, allowing communication with first responders.