The attachments from previous Dyson Airwrap™ models are compatible with the Airwrap Origin (30 mm), unless it is the newer Dyson Airwrap Co-anda2x™ model. The attachments for the Dyson Airwrap™ and the Dyson Airwrap i.d.™ are compatible with each other and also fit the Origin model. The Co-anda2x™ model uses smaller attachments that do not fit on older devices.
The input voltage of the Dyson Airwrap Origin (533896-01) is not specifically stated as 120 V. The device is designed to operate on a mains voltage that is common in most countries, typically 230 V in Europe. There is no indication that it is specifically designed for 120 V.