Welcome to our Frequently Asked Questions page.
If you still cannot find your answers below,please contact us.


Q How does one tell whether the sensor has been matched with the main unit or not?

Slide the magnet near to the sensor, at a distance of less than 3-5mm. If there are any speed data displayed on the unit, we can ensure the sensor has been matched successfully. If not, please try to pair them again according to the manual.

Q What kind of battery do we use?

Most of the Shanren products adopt lithium polymer battery with a protection circuit design. Our battery packs have a battery protection circuit designed to prevent damage induced by a short circuit of outside terminals, and which also protects products from over-charging, over-discharging, and short circuiting.

Q How long is the battery life?

The average rated capacity remains above 70% after 300 cycles of charge-discharge.

Q Why does the red sensor light keep flashing?

Before the sensor pairs with the main unit, the red sensor light will keep flashing.

Q How does one switch to another language?

For the time being, Raptor II does not support switching between multiple languages. It has a variety available, but each unit is preset with one language variant before delivery.

Q What kind of optical design does Raptor II adopt?

Raptor adopts a convex lens which provides a softer, wider beam than what a reflector type (like most flashlights have) would provide.

Q How many lux do the lights produce?

At present, we only provide lumen values for our lamps.

Q How long could the Raptor’s computer work for without the light, after having been fully charged?

The computer could work continuously for at least 215 hours without the light.

Q How long could the sensor work for?

The sensor could work for 1 year if used for 1 hour each day.

Q How long could the computer work for once the indicator light is showing a low battery warning?

The computer could work continuously for at least 8 hours after the light has automatically downshifted for a low battery warning.

Q What is 2.4G wireless?

2.4G digital wireless is referring to a global-standard general working wireless band, which is a short-distance wireless transmission technology. 2.4G brings you the property of strong anti-interference in our operating range of about 10m.

Q What is Lux?

The lux (symbolized lx) is the unit for indicating illuminance in the International System of Units (SI). It is defined in terms of lumens (see below) per meter squared (lm/m²).

Q What is Lumen?

The lumen (symbolized lm) is the international unit of luminous flux. It is defined in terms of candela steradians (cd multiplied by sr). One lumen is the amount of light emitted in a solid angle of 1sr, from a source that radiates to an equal extent in all directions, and whose intensity is 1cd.

Q What is the different between Lumen and Lux?

Lumen and Lux It is possible to draw clear conclusions about the subsequent lighting pattern by combining these two terms.

1. The higher the lumen value, the more light is provided by the lamp.
2. Lux values give information about the brightness of a point in the lighting pattern.
3. The optics determine the distribution of the light from the LED.
4. The more the optics focus the light, the greater are the LUX values.
5. Good optics illuminate close range, sides and distant areas equally well.