eufy Indoor Siren E20 - Requires a US version of HomeBase 2, 3, Mini, or Pro

Full Product Description (From the manufacturer)

The eufy Indoor Siren E20 features a powerful 110 dB alarm designed for whole-floor coverage, ensuring alerts are heard clearly throughout your home. For continuous protection, it includes a rechargeable backup battery that provides up to 48 hours of power during outages and automatically recharges once power is restored. This versatile siren offers flexible installation options: desk placement, wall affixing with 3M strips, or permanent screw mounting. Additionally, it maintains an expansive wireless connection to HomeBase at distances of up to 656 ft (200 m) in open-air environments.