Interconnectable SENTRY Mains Smoke Alarm with Rechargeable Lithium Back‑Up
KF21RLocation
Bedrooms, Living Room, Hallway/Corridor, Attic/Loft (unconverted only)Sensor
OpticalWarranty
10‑year manufacturer’s warranty
Power
230V AC mains with rechargeable battery back‑up
Back-Up Battery
10-year rechargeable / Sealed Lithium Alarm Grade
Grade D1Specifications
| Model | |
| Power Source | |
| Sensors | |
| Audio Alarm | |
| Approvals / Certification | |
| Dimensions | |
| Weight | |
| Temperature Range | |
| Storage and Transport | |
| Humidity Range | |
| Warranty |
- Fully compatible with existing Kidde FIREX hardwired systems
- Clear 4‑SKU Sentry range across Smoke and Heat, Grade D1 and D2
- Installer‑first design supports faster fitting and cleaner replacements
- Backed by a 10‑year manufacturer’s warranty
- Supported by full launch assets including datasheets, product imagery and sell‑in materials
Product Documentation
Specifications
| Model | |
| Power Source | |
| Sensors | |
| Audio Alarm | |
| Approvals / Certification | |
| Dimensions | |
| Weight | |
| Temperature Range | |
| Storage and Transport | |
| Humidity Range | |
| Warranty |
Product Documentation
- Fully compatible with existing Kidde FIREX hardwired systems
- Clear 4‑SKU Sentry range across Smoke and Heat, Grade D1 and D2
- Installer‑first design supports faster fitting and cleaner replacements
- Backed by a 10‑year manufacturer’s warranty
- Supported by full launch assets including datasheets, product imagery and sell‑in materials
Comparison Chart
Model Number
Detection Type
Power Source
Battery Life (Minimum)
Never Change Battery
Interconnected Alarms
Voice Alerts
NCC Certified (for Motorhomes / Static Homes)
10-Year Warranty
KF21R
Smoke
AC / Hard-wired
Back-up battery only
KF21R
Smoke
AC / Hard-wired
Back-up battery only
KF20
Smoke
AC / Hard-wired
1-year (Back-up battery only)
KF20R
Smoke
AC / Hard-wired
Back-up battery only
KF21
Smoke
AC / Hard-wired
1-year (Back-up battery only)