The hand warmer is made of aluminum alloy, and it is safe andnon-toxic. It can be used as hand warmer and power bank for your phone. It canbe used repeatedly and durable for long time use.Features:High quality aluminumalloy material, safe and non-toxic, sturdy and durable.Lightweight andportable, easy to carry and it will not occupy much space.It can beused to warm your hand in winter and can be used as power bank for yourphone.Reusable and durable:it can be used repeatedly and durable for long time use; the cobblepattern hand warm looks fashionable and beautiful.It can becharged quickly and keep warm for a long time; and it is safe andblast-proof.Specification:Condition: 100% Brand NewMaterial: Aluminum Alloy+ ABSColor:Silver, Golden, Rose Golden, Blue, Black(Optional)Size: approx. 10.2*5.9*2.4cm/ 4.01*2.32*0.94inVoltage: 5VCharging Time: 5 HoursWeight: approx. 153g/ 5.39ozPackage List: 1* Hand Warmer1* USB Cable1* Dustcover Bag1* Hanging Rope1* User ManualNotes:1. Please allow 0-2cm error due to themanual measurement. Thanks for your understanding.2. Monitors are not calibrated same,item color displayed in photos may be showing slightly different from the realobject. Please take the real one as standard.