After me my alarm of Abus now some has cost me, the wireless siren of ION made mainly by the significantly cheaper attentive. Delivery was quick. The device makes a high quality impression. The batteries were beige supplies. The teaching in the ABUS system went RuckZuck. I do not know how loud the Abus siren, but this thing has it in itself.
Conclusion: a lot of money I saved and I am very satisfied with the quality "!