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Bluetooth alarm kits

 prices on 2 models  

Bluetooth

— commonly used wireless communication standard. Operates in the 2.4 GHz band; unlike Wi-Fi, it is used only for direct connection between devices. It is also poorly suited for professional use (in particular, the response delay can reach 2-3 seconds), and therefore it is found mainly in household kits designed for connection to smartphones / tablets or smart home systems. The most commonly used protocol for communication is Bluetooth LE, which is supported by Bluetooth 4.0 and higher modules: it is specially designed for miniature devices with a small capacity of built-in batteries, allows data transmission with very low energy costs, and at the same time provides a range of up to 100 m.
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Security System / Smart Hub Xiaomi Smart Home Hub 2
Xiaomi Smart Home Hub 2
Operating temperature:-10 °C ~ +50 °C
Price from £24.99 up to £37.00 
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3 store 3 offers
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Security System / Smart Hub Xiaomi Aqara Hub M2
Xiaomi Aqara Hub M2
Operating temperature:+5 °C ~ +50 °C
Price from £43.19 up to £46.00 
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2 store 2 offers
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