Aiphone Corporation JO-1FD Video Expansion Station. The JO series is a 1 x 2 system which features a 7" screen with electrostatic touch buttons and door release. The JO master and expansion station is less than an inch thick and allows VOX or PTT communication. The JO series is available in three easy to install kits, each featuring a single master station, a power supply, and one of three different door stations. The JOS-1A kit includes the JO-DA surface mount plastic door station. The JOS-1V kit features the JO-DV surface mount door station with a zinc die cast faceplate. The JOS-1F kit contains the JO-DVF flush mount door station with a stainless steel faceplate. The JO-1MD master station is included in all kits and the JO-1FD expansion station can be purchased separately. The system connects easily using 2-conductor to the door station and 6-conductor between internal stations. Features include electrostatic touch buttons, VOX or PTT communication, available internal expansion unit, simple 2 wire connection to door, kits to ensure correct system configuration.