WK40 is a interesting flashlight. It has 4 color LEDs, white, red, blue and green, which can be turned on separately, and can also be colored gradient and flashing. There are two switches, the tail switch adjusts the mode, and the magnetic ring switch adjusts the brightness.It is powered by one 21700 Li-ion rechargeable battery and it is rechargeable via USB-C for optimum convenience.
There is a white WK40 diffuser in the package as a gift.Thanks!

Specifications
1.Emitter: white LUMINUS SST20 6000-6500K
Red beam:  LUMINUS SST-20-DR-B120-V660
Green beam:  LUMINUS SST-10-G-B130-E530
Blue beam:  LUMINUS SST-10-B-B130-N450
2.Driver: Buck constant current circuit
3.Beam angle:125°
4.Operating voltage: 2.7V – 4.2V
5.Battery options: 1* 21700 Li-Ion battery; 20350 li-Ion battery with short tube
6.Dimension: 123.3mm (length) x 33mm (head diameter)
7.Weight: 125 ±1 grams (without battery)
8.Toughened mineral glass lens
9.Water resistance i.a.w. IP68 
10.Mode Memory: memorizes the last brightness level used in the general modes 
11.Reverse polarity protection to protect against improper battery installation.
12.LVP: while on, if the battery voltage is lower than 2.7V, it turns off automatically.
13.Advanced Temperature Regulation (ATR) technology: ATR will reduce the brightness level automatically when the driver temperature reaches 55℃ to prevent overheating.

SHIPPING
The final shipping cost and estimated delivery timeframe will be available to you during checkout. Currently, we offer 3 International shipping methods which are steady and easy to track. Priority worldwide shipping, Premium ( Partial countries) and a faster Express shipping. The estimated times stated below are not guaranteed. An international package could experience delays like postal strikes or severe weather or Cov-19 situation. All shipping ways, PO Box address is not acceptable.

For some flashlights, there's a pure battery inside（phone charging）,If We can not ship your packages via USPS or DHL,we'll ship your package in another way.

If you don’t receive your order within the estimated time frame provided below and suspect that it might be lost in transit, please contact Flashlightgo Support ( support@flashlightgo.com ) and we can look into the order with the courier. Lost-in-transit requests must be submitted to Flashlightgo Support within 3 months of the date of shipping or before the courier archives the tracking information.

Option 1.
Express by DHL/UPS/Fedex/Aramax/SF etc ( there may be tax need to pay in this way),
The estimated time of delivery is usually 3-7 work days depending on the country. Includes detailed tracking and confirmation of delivery.

Option 2.
Premium ( 6-10days, All tax and Duty Paid),
All tax and duty are prepaid to carrier by Flashlightgo before shipping, so you dont need to pay any tax or duty when you get it.

Option 3.
Priority shipping(1-2 Weeks, average 10 days)
If we marked it is with all tax and duty paid, all tax and duty are prepaid to carrier by Flashlightgo before shipping, so you dont need to pay any tax or duty when you get it.

Learn more,Please click on Here.

To ensure that you get the desirable product, we allow a seven-day product return period. Any product return application outside this period will not be entertained.
All returned product must be unused and the original package should be kept.

Return：
We do not offer return for personal products like socks and hats or food, magazine and fragile or dangerous products The original receipt must be available for application of return.

Discount products：
No product return for discount products

Gifts products：
If the item is marked as a gift when purchased and shipped directly to you, it cannot be exchanged , refunded or warranty.

Exchange：
We only replace items if they are defective or damaged.
Exchange service are offered only to wrong deliveries or product damage not caused by client. If needed, please email to info@flashlightgo.com.

Warranty
How long is the warranty period?
Flashlightgo warrants to the original purchaser that the Product(s) shall be free of any defect in material or workmanship for a period of one year for labor and one year for parts from the date of the original order except the items listed below:
Chargers,Batteries and Other Accessories: 3 months warranty

Should the Product(s) supplied by Flashlightgo prove defective because of improper workmanship or material as reasonably determined by us, Flashlightgo agrees, at its option, to either repair or replace the Product free of charge, excluding any shipping or handling charges.

Learn more,Please click here.