Detection angle: about 130°, Detection distance: about 7m, Product model: RTCGQ02LM, Product net weight: 19g (without bracket), Working temperature: -10℃- 50℃, CMIIT ID: 2020DP12044, Wireless connection; bluetooth version 5.0, Battery type: CR2450, Product size： φ30.2x 33.3mm (without bracket).
Get coupons, create price alert or check price history out! You probably want to know what is the best price?
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.
Latest price update (UTC time):
Banggood
Banggood warehouse is located in China. I am tired of searching coupons, but I found one for you…
Link: Banggood product page
1. ($18.69): BGSmart6
you should apply the coupon in your cart after clicking “Proceed to checkout”. Click to copy code and open shop.
Additional Banggood coupons: first page and second page
Old coupons (from the oldest to the newest): BG15SH12, BGSTHO15, BGXMNEW02, BGXMHSG, BGXMHUSOR, BGHONEY2110, BG218307, BGSHOM15, BGSHE15, 13f142, BG0f6d3b, BGce29b8, BGCL887, BG6c8cbc, BGba1eee, 6GSGIT, BGD11037, ADMITAD2212
(these codes were not working in latest coupon update, but you can check them out anyway)
Price history and price alert
Check out price history chart (for all/most countries) for Xiaomi RTCGQ02LM Human Body Sensor. The lowest price was: $11.49.
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)).