There'S Nothing More Frustrating (Or Painful) Than Stubborn Milk That Just Won'T Release. Instant Heat Breast Warmers Are Convenient, Hands-Free, Reusable Click-To-Heat Packs That Warm Your Sore Breasts To Help Speed Up Milk Flow And Loosen Blockages + Clogged Ducts. Instant Relief For Breastfeeding Pain - No Microwave Needed. Use Before Or After Nursing And While Pumping To Milk It For All It'S Worth. Reusable Click-To-Heat Relief In An Instant For Nursing + Pumping Moms - 2 Sets - 2 Small + 2 Large Heat Packs • Increase Milk Flow: Vibration + Heat Bust Through Buildup + Clogged Ducts, And Get Milk Flowing. Choose The Mode You Need To Get The Job Done • Relieve Clogged Ducts + Engorgement: The Breast Care Tool To Have On Hand For Pain-In-The-Breast Nursing + Pumping Moments And To Prevent Other Symptoms And Supply Issues • Different Ends + Sides: Help Unclog Stubborn Ducts, Pull Out Blocked Milk And Empty Breasts • Pocket-Size + Rechargeable. No Batteries Needed, Just Recharge With Usb Cord - Even On-The-Go! • Water Resistant. Designed To Be Used For Massages In The Shower (When The Flow Won'T Go!)