Upgrade your WF-1000XM4 wireless headphones with this comprehensive battery replacement kit. The package includes two Z55H replacement batteries and all the necessary installation tools to help you restore your headset's performance. These batteries are specifically designed to be compatible with your WF-1000XM4 headset, offering a reliable power solution. The included tool kit makes the battery replacement process more manageable, even for those new to DIY repairs. Whether you're experiencing reduced battery life or simply want a backup power solution, this 2-pack provides excellent value. Keep your premium headphones performing at their best with these replacement batteries. Please note that proper installation is essential for optimal performance.