The redeveloping is based on the traditional road lamp housing to ensure it is available for the original lamp. It has pretty good dust proof function.

运用传统路灯外壳进行改造，便于在原有基础上的更换，有很好的防尘效果；

youdao

Curiously, the previous-generation product wasn't rain-proof, but that's been resolved now -- a new water- and dust-resistant housing is designed to let water flow through the eyepieces without accumulation.

ENGADGET