- KIT 1CKD Audio kit, 1+1 techn, one-way EXTERNAL DOOR STATIONS - INTERCOMS One-way audio kit, 1+1 reduced wiring technology, it's of ClicKit series and it's composed by 1 EX311 Exhito intercom + 1 anodised aluminium Click series flush mounted push button panel + 1 PRS210 power supply. Distributed in carton box