Material: Lithium, manganese dioxide, graphite Usage: 1. Please install the batteries according to the polarity of the electric product. 2. Replace all the batteries in a group. Caution: 1. Take out the batteries from the devices when not used for a long time. Swallowing the product may result in chemical burns, soft tissue perforation and even death. Serious burns may occur after taking the battery for 2 hrs. Seek for medical advice immediately after swallowing the product by mistake. Do not dismantle battery.