Battery Powered Internal BT Wireless Siren.

Wireless Siren (internal) for for use with the Wireless BT Alarms.

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Battery Powered Internal Wireless 130 Decibel Siren, for use with the BT  Wireless Shed & Garage Alarm Systems. 

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Battery Powered Internal Wireless 130 Decibel Siren, for use with the BT Wireless Shed & Garage Alarm Systems. 

This affordable internal Siren has a transmission range back to the BT Alarms of 150 ft  (line of sight) this allows it to be installed in totally different buildings or safely hidden away in the same building as the detectors.

We strongly recommend that either this Siren, or the Solar Siren (or both) are used with every system (prevents intruders from thinking about attacking the single alarm).

This unique Siren is designed to trigger 15 seconds after the detector siren, which creates even more disturbance to an intruder, it will operate for 60 seconds but remain fully armed (ready to be activated again).

Ideal for use in most applications, the most common would be:

  • Sheds & Garden Offices (hidden in a unreachable location, or a shed next door, or in the back of the house).
  • Garage (same as the shed).
  • Caravan (hidden in a unreachable location inside the caravan, or in one of the lockable external cupboards).
  • Static Caravans, Park Homes & Log Cabins (hidden in a unreachable location).
  • Boats (hidden in a unreachable location).

Need Advice on choosing the best System for your personal application or Help after you have Purchased one, then please contact

us by:

Telephone: We are still available in the old fashioned way, give us a call on 01604 589414 or 01604 758438 to talk to a real person, we are happy to give you Friendly, No Obligation advice (lines open 8am to 5.30pm Monday - Thursday, 8am to 5pm Friday).

Email: If you don't have time to call us, then send us an email to

Personal Visit: Some customers find it far easier to come and meet us for a Friendly, No Obligation Consultation (click here for full details).

  • 1 x Wireless Siren & Built in 130 Decibel Siren.
  • 2 x AA Batteries.

Internal Battery Powered Wireless Siren:

  • Built in Siren: Yes (130 Decibel).
  • Power Supply: 2 x AA Batteries.
  • Working Wireless Range: 150 ft (line of sight).
  • Size: 2.5" x 3.4" x 1".
  • Colour: Cream.
  • Siren Duration: 60 seconds (but remains fully armed).