1. It is waterproof and can be placed in the open air.
2, sound insulation, good anti-noise effect, can be installed in the downtown area or on the roadside, noise will not affect the quality of the call
3, full-featured, good scalability, secondary development
4, beautiful appearance, eye-catching, easy to find from a distance, find.
5, metal shell, sturdy and durable, long service life, one input, follow-up basic maintenance.