... 3G modem, GPRS, Bluetooth connectionc. Digital keyboard (Pin-pad) with 16 keysd. Finger printer reader, QR code reader, Barcode scannere. UPS(10 ... area. TTW (through the wall) type: unmanned outdoor or 24 hours self-service business hall. The wall mounted type: can ... occasion. The desktop type: some of the attendant business hall, 24 hours self-service business hall, indoor public area and outdoor ...