A must for parents on the go! This latest version gives you instant heat with the snap of a button. The unit remains warm for hours and can be used again and again! The zippered holder accommodates all baby bottle sizes - reusable or disposable.The Velcro® strap attaches easily to your pushchair, changing bags and more. To re-energize the warmer pouch, simply place in boiling water until all the crystals have dissolved. Completely non-toxic. No batteries or electrical supply needed.