... ,etc. Pattern:circular lace,rectangle,carton FOB USD:4 long time hand warmer1) usage:To charge the electric warmer for about ... until the water is boiling 2)venting:after reuse many time ,venting it ,will use longer 3)model: x032 size:15 ... technology energy storage heating agent, the heating temperature quickly one-time water injection, permanent use, unique explosion-proof