$16.55 – The receiver voltage: 110-220V, Waterproof grade: IP44, Receiver size: 95*65*24mm, Transmitter size: 77*46*20mm, Receiver Plug Type: EU/UK/US plug / AU adapter, Color: Black/White, Volume: 4 levels, Ringtones: 58 pcs, Operating range: 300 meters in open area, Brand: CACAZI, Doorbell model: A60, Battery type: 23A12V alkaline battery (battery not included).
According to my DB the lowest price is $16.55 for CACAZI 1 Receiver 1 Transmitter Doorbell (in Banggood). Go down and check coupons out. Remember to check price history if it is available. You probably want to know what is the best price?
Latest coupon code price check (UTC time):
Banggood ($16.55)
Banggood warehouse is located in China. I couldn’t find any coupon for this product on latest product update. Isn’t it too expensive? From what I can see this price is higher than average price ($8.16).
Link: Banggood product page
Price: $16.55
Additional Banggood coupons: first page and second page
Old coupons (from the oldest to the newest): BG0d08f2, 6GSGIT, BG4a7a54, ADMITAD2212, BGSmart6, 8Couponsde, MVC8SPRING, 8BGwbg2204, 2203ActiesNL, tRaDetRaCKeR, 8wEbgaInS5, pROMo8cuPoN, BGJUNEGSG9, TTSUMMER8, Cuponation9
(system checks these coupons on every price check (like once per 24 hours), but you can check them out anyway)
Aliexpress
There’re some similar (or not) items on Aliexpress
You can use link bot to get even lower price:
Click here to search by yourself. Here are coupons that you can use.
Price history and price alert
Price history (for all/most countries) for CACAZI 1 Receiver 1 Transmitter Doorbell is here. The lowest price was: $5.99.
Price records source(s): Banggood
Click on image to enlarge. 
You can set price alert (for Banggood and Aliexpress (only if product name will be the same as on Banggood and I will post it on social media though, so it’s more like Banggood price alert)).