A9 is a complete quad-band GSM / GPRS module with SMD package of compact design. Its stable performance, small appearance, high cost performance, can meet the needs of customers. A9 can be widely used in various Internet of Things occasions, suitable for home automation, industrial wireless control, wearable electronic products, wireless location sensing devices, wireless positioning system signals and other Internet of Things applications. It is an ideal solution for Internet of Things applications. A9 adopts SMD package, which can realize rapid production of products through standard SMT equipment. It is especially suitable for modern production methods of automation, large-scale and low-cost, and is convenient to be applied to various Internet of Things hardware terminal occasions.