How does it work?* no battery or electricity required. Heat pack reacts with small amount of water to create optimal temperature for food & bottle warming for up to an hour.* just add water & activate heat in 30 seconds and warm milk in less than 2 minutes ** warm milk & food instantly anytime, anywhere* reheat foods safely with high-quality rust-resistant type 304 stainless steel* eco-friendly, non-toxic & biodegradable heat packets available in warm & hot* warm & hot packets are one time use - we suggest ordering more heat packets with your purchase* bpa, phthalate, pvc & lead free* Made in South Korea* INCLUDED:(1) stainless bottle with stage 1 nipple(1) warming pod silicone seal(1) warming pod(1) stainless container(1) airtight lid(1) neoprene sleeve(2) 2 heat packs (WARM)(6) pre-order special free heat packs (6 qty - WARM)*** Helpful hints:When you are out of heat packs, simply use hot water to reheat. It may take longer but it would still work. Stainless container is also great for storing & traveling with food with its airtight/leakproof lid. If you want to use the food warmer as a double boiler, add adequate amount of water into the stainless container to heat up the water - submerge baby bottles, baby foods and pouches to warm up and enjoy! Innobaby’s Aquaheat is an on-the-go instant food & bottle warming solution for today's busy parents. It's simple to use as our warming system does not require battery, electricity or microwave to activate heat. Simply add water to the heat packs to activate heat anytime, anywhere, just when you need it. It portable, light weight and simple to use.