Baltra Rustle Heating Cup is used for heating water at a short period of time. This heating cup 12 cm requires 220V-50Hz and 400 W power. This product has an inner heating element tube. So, if you want hot water anytime you can just plug in the wire and have it. It is perfect for the office, home as well as for traveling. It has fine stainless steel and has approx 1000 ml capacity.