This is Micro Charger (USB 2.4 A - to USB-Micro) Be sure to check that your device is compatible! Note: Only compatible with Micro port charger please refer to the detailed models listed in the document. Specifications Brand: KUEVKA Product name: Tandem t:slim X2 Insulin Pump Charger. Cable Length: 6.6 Ft Cable material: Environmentally friendly PVC Cable Color: Black Connector Type: MICRO Transmission speed: USB 2.4A 480Mbs Security: Intelligent IC identification Compatible model: for Tandem t:slim X2 Insulin Pump Charger. Instructions: Removing the old door: Take the pump case off before removing the rubber door. Grip the door firmly where it attaches to the pump and pull to remove. Installing a new door: Push the pointed tab into the hole until you feel a snap. Tip to preserve the USB rubber door: The rubber door swivels 360 degrees around the hole. While charging, make sure you are swiveling the cover rather than bending it backwards to preserve the cover. Additional Services: We pay great attention to the quality of products. If there is any bad situation in the products within 3 months after you receive the package, you can contact us at any time to solve the problem for you. Wish you a happy shopping!