Self Heating cup is special manufactured mug cup which boil water without fire. If you take 7minutes, Self Heating cup can boil water using special manufactured generation of heat material without fire.Also, it is practical product because light and small size. So, it is of great use for outdoors activators.Enjoy coffee & tea anytime, anywhere with Self-Heating cup.How to use1. Put the one piece among 3 pieces of heating element into base caseafter disassemblying cup.2. Assembly cup after pouring water about 40cc into base case additionally.3. Pour proper water into the cup.Size 85x110Volume 300mlComposition - cup cover (P.P), inside cup (SUS), outside cup case (ABS)heating element cup (SUS), bottom case (ABS) and heating material (3 pieces).