Requires eufy HomeBase to Operate: Compatible with HomeBase Mini (v4.0.5.2 or above), HomeBase 2 (v3.4.1.2 or above, released after 2021), HomeBase 3 (v3.7.2.6 or above), and HomeBase Pro (v4.1.4.3 or above). Ensure your HomeBase is updated to the latest version for optimal performance. Loud 110 dB Alarm for Whole-Floor Coverage: Powerful enough to alert the entire floor, ensuring a timely response. Reliable Power with Backup Battery: The rechargeable battery provides 48 hours of backup during power outages and automatically recharges when power is restored. Flexible Installation Options: Place on a desk, attach to a wall using the included 3M adhesive strip, or mount with screws. Expansive Wireless Range with HomeBase: Provides a stable connection with HomeBase at open-air distances of up to 656 ft (200 m).