COMPATIBILITY: The battery model is EB-BR880ABY, it is only compatible with Samsung Galaxy Watch 4 (40 mm), SM-R860 SM-R865 series and Galaxy Watch 4 Classic (42mm) SM-R880 SM-R885, please carefully confirm the model of your smartwatch before purchase. Premium Battery Cell Upgrade: Designed with a brand new, original SDI Li-ion cell, this battery ensures top-tier performance, reliability, and extended battery life. Engineered for durability, it delivers a consistent power supply to keep your device running at peak efficiency for longer. Included Adhesive: Battery adhesive is included for effortless installation. Tips: A new battery needs at least three full charging and full discharging cycles to complete the calibration Step-by-step Instruction: The battery comes with a detailed instruction manual to help you walk through each repairing process, you'll find it is an easy task for you to complete the repair yourself Comprehensive Toolkit: The kit has every tool you need for repairing, it's professional, safe and easy to use, help you to perform your repair efficiently GREEN FUSION for Galaxy Watch 4 (40mm) & Watch 4 Classic (42mm) Battery Replacement, EB-BR880ABY Battery for SM-R860/865 SM-R880/885 Series with Repair Toolkit, Instruction Manual