... No more than 20dBm Non-obstacle remote control: 150 to 180m Wireless Video Door PhoneProduct DescriptionWireless video door phone Established in ... and exporter of GSM car alarm system, GSM home alarm system, wireless intruder alarm system, China alarm system factory, China ... : No more than 20dBm Non-obstacle remote control: 150 to 180m With micro-dealing technology, auto-remote control, fine ...