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Suitable for toys, electronic gifts, remote controls, calculators and other small electronic devices. The model is BS-2450-4 BS-2450-4SMT, please check carefully. The size is 30×9mm, and it is suitable for CR2450 button battery, which is easy to install and has strong compatibility. 2Pin SMD interface design, easy to surface mount welding and ensures stable connection. It comes with a battery cover, which effectively prevents the battery from falling off or short circuit and enhances safety.