Note:
Aurora A4 has updated to Aurora A4x:
Lumen: From 550lm to 650lm
Battery capacity: From 130mAh to 260mAh
Constant current circuit, PWM improved
But the logo still uses A4 TI

Specification:

Brand	Rovyvon
Model	Aurora A4x (Updated version)
Tritium vial light	No
LED & Lumen	XP-G3: 650lm Nichia 219C: 450lm, 90+ CRI
Material	Titanium
Battery	Built in 1x 260mAh lithium battery
Max runtime:	30 Hours (Moonlight mode)
Charging	USB Rechargeable, fully charged in 70 minutes
Waterproof	Equivalent IP65 weather resistance
Length	57.3mm / 2.26”
Diameter	15.6mm / 0.61”
Weight	19.96g / 0.704oz

Features:
Made of titanium.
XP-G3 / Nichia 219C LED, Max output 650 lumens.
Built-in Micro USB charging port.
260mAh lithium polymer battery.
Charging indicator & quick charged in 45 minutes.
Side switch prevents accidental activation.
Ergonomic design, one-hand operation.
Tail paracord hole.
Glow bar slots for DIY.
A lanyard and two-way clip included .
IP65 water resistance.

Package includes:
1 x  Aurora A4 flashlight
1 x User manual
1 x Beaded chain
1 x Clip
1 x USB cable 
1 x Lanyard

Note: This item is LED Keychain Light Without Tritium Light On The Tail.

Know more:
Based on the feedback from our customers, users, and fans, we started the work of upgrading the original Auroras keychain flashlights. The improvements are mainly about the battery, operation/UI, and output, etc. Though it utilizes the same LED -  XP-G3, thanks to the optimized board driver, the max output it goes to 650 lumens; the optimized driver also brings a better UI and got the PWM issue fixed. As for the runtime, the upgraded Auroras keychain lights are powered by 260mAh rechargeable battery which provides a max 32 hours of runtime at moonlight mode. 

Recommendation:

RovyVon Aurora A4 T1 With Tritium Light On The Tail:	https://www.banggood.com/RovyVon-Aurora-A4-T1-550lm-Mini-Tritium-Keychain-Light-USB-Rechargeable-Flashlight-With-Tritium-Light-Mini-Torch-LED-Work-Lamp-Hunting-Camping-Emergency-Lantern-p-1437479.html
1.5x6mm DIY Tritium vial light:	https://www.banggood.com/1_5x6mm-Trit-Vials-for-DQG--DQG-Fairy-LED-Flashlight-p-921950.html?rmmds=category