POS (point of sale) is a multi-functional terminal, installed in the credit card merchants and acceptance outlets and computers linked into the network, it can realize the automatic transfer of electronic funds, it has support for consumption, pre-authorization, balance inquiries and transfers and other functions, the use of safe, fast and reliable. The POS battery has a high energy density and high capacity, explosion-proof rating: Exib iiB T4, and waterproof rating: IP97