Typically, lights for bicycles should have weatherproof housing. And other important performance indicators are as follows.
Firstly, the light source had better be LED lighting. The rear lights with LEDs are more reliable and able to work for a longer time than, for example, halogen lights. They also have the ability to reproduce a moderate or strong light. Moreover, LED lights are at low power.
Secondly, lumens, the determining unit of luminous flux, is another thing we should take into account as well as. It characterizes the intensity of light and measures it at the same distance from the object.
Finally, it would be a very good option if there are multiple modes. This will greatly save battery power to continue the work without recharging.
If you are badly in need of this, I would recommend you the 3-in-1 bicycle wireless rear light. It is a smart device with intelligent sound and anti-theft alarm. In addition, with IPX5 waterproof housing, COB light source, and 800mAh lithium battery, it gets a long lifetime and supports longtime continuously working. And it has 3 modes for adjustment, which is really energy-saving and provides more convenience for users. Moreover, this novelty supports remote control and USB charging. This undoubtedly provides more convenience in finding your own one among the large quantities of bikes at the parking lot. And the USB charging makes it no need of battery replacement.