STI 3300 Wireless Doorbell Extender and Chime Receiver

Make sure important arrivals and alerts are heard throughout your facility with the Safety Technology International STI 3300 Wireless Doorbell Extender and Chime Receiver. Designed for businesses and homes that need dependable notification coverage, the STI‑3300 wirelessly extends a traditional hard‑wired doorbell so you can hear chimes in reception areas, back offices, retail floors, or remote monitoring rooms. With up to 500 ft line‑of‑sight range and a plug‑in 120VAC receiver, installation is fast and requires no new wiring—ideal for retrofit projects and tight maintenance schedules.

This chime receiver offers two selectable sounds, adjustable high/low volume, and a supervised low‑battery alert to support continuous security and monitoring operations. The receiver is compatible with other STI chimes, enabling multi‑zone notifications that integrate with your physical security and surveillance workflows. Backed by a one‑year limited warranty, the STI‑3300 delivers a practical, cost‑effective way to improve situational awareness and visitor response across large or noisy environments. Add the STI‑3300 to your security deployment or facility upgrade to improve notification coverage—order today or contact us for bulk and integration options.

• Extends doorbell coverage so staff and occupants never miss a visitor or alert, even in distant rooms or warehouses
• Quick, wireless installation—plugs into a 120VAC outlet and pairs with existing hard‑wired doorbells with no new wiring
• Long-range operation up to 500 ft (line of sight) to cover large homes, offices, retail floors or monitoring stations
• Supervised low‑battery alert and adjustable high/low volume for reliable, configurable chime monitoring in noisy environments
• Two selectable chime tones and cross-compatible receivers let you tailor alerts across multiple zones for security and operational workflows