The A1C case is designed to be compatible with the Tandem pump. The case has a positive lock and hinged clip to help prevent unwanted removal from clothing. The case has a second positive lock to help prevent the pump from falling out of the case. The A1C case will also let you access all of the important pump features (programming, refilling and recharging) without being removed from the case. The A1C case can be rotated 360°, in the horizontal, vertical or angled positions for easy screen viewing while on clothes. The pump can easily be removed from the case without disconnecting the tubing. The A1C case is made from strong plastic resin to provide durability and a stainless steel spring and pin to provide strength. This case is made in the USA.