1.You can contact the customer service. for any question regarding the product.
2.Ask the question in English to get answer faster.
3.Keep your question short and to the point.
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A part of the review has been auto-translated.
Small module for alarming when there's no 220 V mains. It works with 3 V and there's a switch to stop it if it takes too long to restore power. You will need the schema in this page to identify component values.
parfait merci
Tips:For questions about your order, place of delivery, product discount, taxation, delivery time, warranty, shipping, payment, exchange rate, and other questions unrelated to the product, please contact customer service.
A part of the QA has been auto-translated.