38205.37.WH1 # 38205 | Ajax ReX Jeweller white is a powerful range extender that amplifies the radio communication of Ajax security systems, ensuring stable and secure connections via the Jeweller protocol with advanced encryption and authentication. It extends the range up to 1,800 m without obstacles, allowing coverage of large and complex facilities while maintaining ultra-fast response times with event delivery in just 0.3 seconds. It operates up to 35 hours thanks to the backup battery and integrates anti-tampering functions for maximum protection. Installation is immediate via QR code and management can be done remotely via the Ajax app, offering a professional, secure and easy-to-implement solution. Ajax
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38205.37.WH1 | WIRELESS RADIO SIGNAL REPEATER

The Ajax ReX Jeweller, 38205.37.WH1, white, is a wireless range extender designed to safely and efficiently extend the coverage of Ajax security systems using the Jeweller protocol with encrypted two-way communication. Capable of extending the signal up to 1,800 meters in open terrain, it ensures stable transmission, anti-jamming protection, and instant notifications with alarm delivery in just 0.3 seconds. Thanks to the built-in backup battery, it offers up to 35 hours of battery life in the event of a power outage, while QR code installation ensures quick and intuitive setup. Perfect for large and complex facilities, it allows full remote control via the Ajax app and maintains high performance even with numerous connected devices.
Main specifications:
- Jeweler encrypted communication with anti-jamming frequency hopping
- Signal range up to 1,800 m and alarm delivery in 0.3 s
- Up to 35 hours of battery life thanks to the backup battery
- Immediate installation via QR code and configuration from the app
- Tamper-proof protection with dedicated alarms on the lid
- Compatibility with all Ajax hubs for coverage of large facilities
Further details
ReX ensures extremely fast alarm transmission, with a delivery time of just 0.3 seconds , maintaining system responsiveness regardless of the number of connected devices. This allows for near-instant notifications, essential for timely management of security events.
Technical data sheet
| 38205.37.WH1 | |
| Classification | Radio channel range extender |
| Device type | Wireless |
| Installation | All Ajax hubs featuring OS Malevich 2.7.1 (and higher) Doesn't support MotionCam detectors |
| Alarm signal delivery time | 0.3 seconds |
| Maximum connected devices (in a system with one range extender) | Hub, Hub 2, Superior Hub Hybrid — up to 99 Hub Plus — up to 149 Hub 2 Plus — up to 199 |
| Max number of connected ReX per hub* | Hub — 1 Hub Plus/Hub 2/Hub 2 Plus/Superior Hub Hybrid — 5 |
| Operating system | O.S. Malevich |
| Power supply | Mains supply: 110−240 V Battery backup: Li-Ion 2 А⋅h Up to 35 hours of offline operation |
| Jeweler radio technology | Communication range with detectors: up to 1,800 m in the line of sight Two-way communication between devices Radio frequency bands: 866.0 - 866.5 MHz 868.0 - 868.6 MHz 868.7 - 869.2 MHz 905.0 - 926.5 MHz 915.85 - 926.5 MHz 921.0 - 922.0 MHz (depends on the region of sale) Self-adjusting RF output power: up to 25 mW Block encryption based on AES algorithm Detector polling period: 12−300 s Frequency hopping |
| Operating temperature range | From −10°C to +40°C |
| Permissible humidity | Up to 75% |
| Anti-sabotage | Fraud protection Jamming notification Tamper-resistant |
| Dimensions | 163 x 163 x 36 mm |
| Weight | 330 g |
| Complete set | ReX radio signal range extender SmartBracket mounting panel Power supply cable Power cable Installation kit Quick start guide |
| Warranty | 24 months |



