Cashless Payment: Serial Payment Interface interface module allows PC to be used as subordinate cashless payment device to an existing vending machine. Vending Machine Use: PC to Serial Payment Interface adapter box is used for the existing vending machine, allowing the PC to work as a payment device. Easy Connection: Serial Payment Interface RS232V5 adapter box can connecting any Serial Payment Interface vending device to a PC through a serial port, which is easy to use. Convenient Use: Vending machine adapter allows you can send a simple list of commands and then connect with the machine to add credits. Portable Size: PC interface to Serial Payment Interface adapter box is compact, small in size and light in weight, portable and does not occupy too much space. 1 x MDB Adapter Box1 x USB Cable 1 x RS232 USB Adapter1 x Cable4 x Screw kit1 x Instruction Item Type: Vending Machine Serial Payment Interface Adapter BoxMaterial: ABSModel: Serial Payment Interface-RS232V5Purpose:Connecting Vending Machine and PC Through Serial Payment Interface Adapter Box Item Type: Vending Machine MDB Adapter BoxMaterial: ABSModel: MDB-RS232V5Purpose:Connecting Vending Machine and PC Through MDB Adapter Box