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 velcro174 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