... connected to two outside wiegand readers.CHD802B: with an internal EM reader,can be connected to a standard wiegand reader.CHD802M ... reading, long-distance control and button4, Network Support: RS485/RS4225, Locks: magnetic lock, electric insertion lock, pulse lock, etc.6, Power ... preferred); Consumption<1W7, Working terperature: -10-55, working humidity: <98% EM/Mifare Rfid Access Controller