1.Crystal Sound, Excellent Signal - Our intercom system is inserted superior crisp chip to provide you the crystal sound quality and prevent interference. The effective distance of this intercoms wireless is 1 to 1.5 mile up to the actual circumstance. Perfect for department to department, room to room, building to building communication 2.10 Channels 3 Digital Code for Communication - This wireless intercom system has 10 channels (made of Advanced anti-interference technology) and 3 secret digital codes to meet your different communication requirements in different situations. Perfect for home, office, restaurant, bank, policy office, hotel, etc 3.Multifunctional Intercom System - Our home intercom system has 4 main functions, including monitor, talk, group and call. Widely used for home and office communication, perfect for one to one, one to many communication, make your life and work communication become more convenient 4.Easy to Power, - This wireless intercom is powered by a USB cable, which is easy for connected by Power bank. No need battery charging or phone wire on the wall. Suitable for both indoor and outdoor usage, and help you keep your space in original shape, clean and you can take it to any place you want