Size 92mmx 15.4mm (Lengthx Diameter), Battery 1x AAA Alkaline battery or 1x 10440 li-ion battery (not included), Light intensity 2000cd, Output 378 Lumens, Modes 3 gears (Moon – Mid – High), Irradiation distance 89m, LED Beam Luminous SST20, Runtime Moon-0.6lm, High-378lm, Mid-90lm, Waterproof IP67, Weight 24g, Model A02, Continuous working time 4 hours, Drop height 3m.
Check coupons or create price alert down below. 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.
Link: Banggood product page
1. ($16.99): FIN4071
2. ($18.44): BG8Alerabat
3. ($18.44): BGOutlight10
put item in your cart and apply coupon code there 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): BGA02, BGASTROLUX, BG1128, BGAST25, BGSM30%, BGASA02, FIN7140, BG10OFFAFF1, BANGGOODSD, BGTorch4, BGASTB, BGXMAS58, BGAlerabat15, BGtorch7, BGtorch2, BGAlerabatI, BGASTC, BGea6033, BGLED07
(these codes were not working in latest coupon update, but you can check them out anyway)
Price history and price alert
Price history (for all/most countries) for Astrolux A02 SST20 Keychain Flashlight is here. The lowest price was: $10.67.
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)).