The Advanced Single Electric Breast Pump is designed with our PerfectlyPure™ closed system, which prevents milk backup and provides easy cleaning. This breast pump includes 2 flange sizes and is compatible with our AdvancedFit™ flange system, which has 6 different sizes available. Enjoy slouch-free pumping with our PerfectPosition™ flange angle, and easy fingertip control for quick on/off and customizable vacuum. Super compact, lightweight, one-hand design is perfect for pumping on the go or a night out away from baby. The Advanced Single Electric Pump can be powered by the provided AC adapter or 3 AA brand name batteries (batteries sold separately). Plus, this breast pump works with the Advanced Milk Storage Bag Adapters, allowing you to store milk faster and reduce milk loss when transferring from collection bottle to storage bag. Includes Electric Breast Pump, 5 fl. oz. Milk Collection Bottle, Cap Ring, Sealing Disc, (1) 30.5mm Flange Kit, (1) 24.5mm Soft Flange Insert, AC Adapter, Instructions to Access Simply Breastfeeding™ Program and Instruction for Use.