$17.90 – Tailstand: Yes, LED: SST40 6500K white tint, Mode memory: yes, Reverse polarity protection: Yes, Color temperature: 6500K, Low voltage warning: Yes, Reflector: orange peel, Battery included: no, Range: 50 – 100 meters, Whether to charge: no, Number of lamp beads: 1, Lens type: Ar-coated glass lens, Whether to remember the gear: yes, Light effect color: white light, Body color: titanium gray, Is it waterproof: level 8, Voltage: input voltage 3 – 4.2V, Lumens: 2300LM (maximum), Required battery type: 21700 or 18650 lithium-ion battery (not included), Required battery quantity: 1pcs.
Convoy S21A SST40 Flashlight is for $17.9 (in Banggood). Just check coupons out (with price alert and history). Best price?
Latest price update (UTC time):
Banggood ($17.90)
Banggood warehouse is located in China. You probably want to know if this is a good price. IMHO this is a good price, coz it’s lower than average ($18.42) There is one great coupon!
Link: Banggood product page
Price without coupon: $18.79
1. ($17.90): BG28c015
paste coupon code in your cart and click Apply 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): BGS21A, BG7S21A, EYBG, BGTORCH, 502C6B, BGBFCR41, fInbG2020, BGff2020, BGCONVOYSS, BGCONV, BGflashlight, BG10OFFAFF1, BANGGOODSD, BGTorch4, 00c906, BGtorch2, BGtorch3, BG8Alerabat, BGLED07, F03081, BG5de8a6, FIN1443, BGOutlight10, BG29ddce, BG6be74d, BGBLF26, BG589b2e, BGd57765, BGHOBBY240, Fin0308
(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
Do you need price history chart (for all/most countries) for Convoy S21A SST40 Flashlight? There we go. The lowest price was: $16.99.
Price records source(s): Gearbest, 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)).