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Frequency 433.5MHz, use 2032 button battery.
https://www.tamkeen-itc.com/shop/ds-tmg012-a1newgray-frequency-4335mhz-use-2032-button-battery-27978
https://www.tamkeen-itc.com/web/image/product.template/27978/image_1920?unique=ec391c8
Wall mount bracket
(gray)%5D%20Frequency%20433.5MHz,%20use%202032%20button%20battery.?unique=ec391c8)