ZiLu Premium Leather Rechargeable Battery Case for Samsung Note II - Pink Leather for Fashion ZiLu's Patented Energy Management Technology. Increases run time of your iPhone by 150% or more. Protects your Samsung Galaxy Note II's internal battery extending its life. Advanced circuitry prevents short circuiting, overcharging, over discharging, energy flow-back, and malfunction to protect you and your iPhone. Charge, sync and use all of your iPhone functions and applications while your iPhone is in the ZiLu smart battery case.