Outdoor Bell Box

BX-35ULE bell box is a battery-operated wireless outdoor siren generating a loud 104 decibel siren sound and strobe lights during an alarm to provide visible and audible alerts. Encased in a durable, IPX5 waterproof elegant design, easy-to-install BX-35ULE is a premium choice for the modern smart home. The BX-35ULE generates unique alarm sounds for fire and burglary to inform users of the type of danger at hand. It provides programmable siren duration of 3, 5, and 10 minutes.

In addition to producing audible and visible warnings in the case of emergency, the BX-35ULE emits beep notifications for arming and disarming of a security system, and of its low battery status. Its tamper-deterrent feature protects against unauthorized removal and sabotage.

104dB at 1 Meter
Audible & Visible Alert
Status Notification
EN50131 Grade 2


  • Siren output level is 104 dB at 1 meter
  • Unique alarm sounds for fire and burglary
  • Lightweight and flexible to install
  • Modern & Elegant design
  • Programmable siren duration of 3/5/10 minutes
  • Regular supervision signals to check system integrity
  • Low battery detection
  • Tamper protection prevents unauthorized removal
  • IPX5 waterproof and UV resistant housing
  • Sound notifications of arming, disarming, & low battery status


  • Communication Protocol: DECT ULE RF Protocol
  • Frequency: 1880 MHz -1900 MHz (EU) / 1920 MHz - 1930 MHz (US)
  • Power Source: 1.5V, D Alkaline battery x 2
  • Battery Life: 3 years
  • Siren Output: 104 dB at 1 meter
  • Operating Temperature: -10°C to 45°C (14°F to 113 °F)
  • Operating Humidity: Up to 85% non-condensing
  • Dimensions: 223 mm x 223 mm x 68 mm

Product Documents