Every delivery notification becomes an instant alert when X-Sense with SBS50 base station connects to 2.4 GHz Wi-Fi, sends push notifications, adjusts volume up to 100 dB, and supports multi-user access. The IP65 housing withstands temperatures from -10 to 140°F, the battery lasts up to 4 years, and installation takes just minutes. Now your mail is under control, even in extreme weather