Each card pack sold in this link contains 5 Pack 23a batteries, with multiple compatibility, equivalent to the following brand models: Energizer A23 12V Duracel MN21, MN21, GP23AE, A23S, 23A, 21/23, GP23A, MS21 ,23AE, MN21B2PK, L1028, 8F10R, E23A, K23A, 23GA Mainly suitable for garage door opener remote control, car alarm remote control, doorbell, anti-theft alarm remote control, lighter and other electronic equipment 1. The 23a battery 12v sold by KaPonsec have undergone strict quality control and power testing, and have passed the CE certification to ensure that each battery has sufficient voltage and long life. At the same time, the zero mercury design makes users more at ease. 2. Using the best materials and more precise technology, it can effectively retain 12v 23a battery power and extend battery life and storage time. The validity period is at least three years, far exceeding other batteries with a shelf life of 1-2 years. 3. Exquisite craftsmanship and high-quality materials make the 23a batteries more powerful, coupled with a professional leak-proof design, so that the battery can last longer 4.The professional child-proof packaging design can reduce accidental intake by children (However, parents still need to place the removed battery out of the reach of children.) 5. Please do not touch the 23a batteries by mistake to avoid short circuit, reverse connection, battery heat and explosion. It is recommended to store the battery in a low-temperature and dry environment, which can relatively extend the storage time of the battery 6. You will get 5 packs of 23a batteries, packed in precise blister packaging, zero mercury, no pollution and peace of mind service