Model Number: DT105U / DT105R and PB105 Brand Name: Promag Key Specifications/Special Features: DT105U ( DT105R ) cash drawer trigger is designed to provideUSB (RS-232) interface to the cash drawerThis allows the cash drawer, which is previously connected toPOS printer or cash register, to be directly connected to a USB(RS-232) port of the computerThrough the DT105 the cash drawer can be directly connected tothe computer when there is no printer used in the POS systemDT105 is to open the cash drawer when it receives the triggercommand or the RTS/DTR signal control from the computerPB 105 printer beeper is to be connected to the cash drawerconnector on the printer when the cash drawer opens and needslouder beep sound for the printer