eufy Security Indoor Siren E20 110 dB Alarm

The eufy Indoor Siren E20 is a compact, HomeBase‑linked alarm that delivers a 110 dB alert with a rechargeable backup battery and multiple mounting choices for reliable whole‑floor notification.

The E20 is designed to expand your eufy Security system by providing a loud, standalone alarm that pairs with a compatible HomeBase unit. It doesn’t function on its own; instead it connects to HomeBase models Mini, 2, 3, or Pro (with specific firmware requirements) and activates when the system detects an event. With a focus on clear sound output, dependable backup power, and versatile installation, this siren helps increase the audible reach of your existing setup.

How loud is the siren and what area can it cover?

The E20 produces up to 110 dB, enough to be heard across a typical single floor of a house or a medium-sized apartment. Sound projection is influenced by room layout and furnishings, but the unit’s output is engineered for fast attention and clear notification.

• Maximum alarm level: 110 dB for prompt alerts
• Designed for whole‑floor audibility in common residential layouts
• Placement affects reach—higher or central positions improve coverage

What power options and backup does the E20 provide?

The siren runs on AC power during normal operation and includes a built‑in rechargeable battery that provides temporary operation during outages. The battery recharges automatically when mains power resumes, so the unit stays ready without manual swapping.

• AC‑powered for continuous use with automatic charging
• Rechargeable backup battery offers up to 48 hours of emergency operation
• Automatic recharge when mains power is restored

How do I install the siren in my home?

Installation is flexible to suit different mounting preferences. You can place the E20 on a shelf or table, attach it to a wall using the included 3M adhesive strip for a no‑drill option, or secure it more permanently with screws.

• Tabletop placement for instant setup
• Included 3M adhesive strip for tool‑free wall mounting
• Screw mounting for sturdier, long‑term installation

Which HomeBase models are compatible and what firmware do they need?

The E20 requires connection to an eufy HomeBase; it is not a standalone alarm. Confirm your HomeBase model and firmware version to ensure compatibility before purchase or installation.

• HomeBase Mini: v4.0.5.2 or newer
• HomeBase 2: v3.4.1.2 or newer (models released after 2021)
• HomeBase 3: v3.7.2.6 or newer
• HomeBase Pro: v4.1.4.3 or newer

Finally, the E20 communicates with HomeBase over a robust wireless link that can reach up to 656 ft (200 m) in open air, giving you flexibility to position the siren where it will be most effective within those signal limits.

Who is this for? The eufy Indoor Siren E20 is aimed at homeowners and renters who already use or plan to use an eufy HomeBase and want stronger audible alerts across a floor. It fits people who prefer a tamper‑resistant, rechargeable siren with multiple mounting options and extended wireless range, and who will verify HomeBase firmware compatibility before adding it to their security system.