The product is a set of ten (10) Murata 365/366 1.55V Silver Oxide batteries, designed to replace Sony 365/366 batteries. These coin cell/button batteries are ideal for use in watches and other small electronic devices. With a long-lasting power source and reliable chemical composition, these batteries provide a consistent and efficient energy supply for your timepiece or other equipment. Murata is a trusted brand known for producing high-quality batteries, making this product a dependable choice for your needs.