KRSYTALH Heavy Duty Shock Absorbing Stud Rhinestone Bling Dual Layer Hybrid High Impact Protection Cover for Apple Iphone 6 Plus (5.5-Inch) + 1 PC Anti-Static Silicone Neck Lanyard for Cell Phone Random Color (Hot Pink) Handmade item Use rechargeable lithium polymer battery. Built-in short circuit and over-charge protection. Safety First! We can provide custom phone cases with any design for you. If you want, please contact us! Snap-on design. No tool is required for installation.