500mAh Mode: white light for 4 hours; flashing white light for 9 hours; red and blue highlight for 2 hours; red and blue low light for 4 hours; red and blue flashing for 10 hours; red and blue alternately flash for 5 hours.
Go down and check coupons out. Remember to check price history if it is available. What is 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):
Price history and price alert
Check out price history chart (for all/most countries) for Utorch 7505C Waterproof Bike Light. The lowest price was: $4.99.
Price records source(s): Gearbest
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)).