VERSATILE USE: Perfect water or coffee and tea heater at home, at the office, on a business trip or while you travel.For best results, use with glass or ceramic containers only SIMPLE TO USE: Just fill your container, put the water cup heater in the liquid, and lastly turn the heater on. Keep watching and keep hands off. Once water is hot enough or boiling, unplug the heater and wait a few seconds before removing it from the water. Complete set: Package includes immersion heater, storage bag, and multifunctional power adapter 2 Pack DUAL VOLTAGE: Compatible with both 120V and 240V power sources, making it perfect for worldwide travel use and camping adventures After sales support: If you have any questions or concerns about this product, please contact us through Amazon. We will make every effort to provide you with a satisfactory shopping experience. Use this multifunctional 300W dual voltage immersion heater to turn any container into a hot water source. This portable heater is perfect for camping trips, traveling, or making hot drinks on the go, and can use 120V and 240V power sources. Compact design with protective storage bag and durable heating element. Whether you're brewing tea in a hotel room or heating water at a campsite, this travel accessory offers convenience and flexibility. The packaging includes an immersion heater, power cord, and storage bag. The efficient design of water heaters helps to quickly heat small amounts of water, making them an ideal choice for individual or small group use. Only heaters with appropriate containers can be used.