Our company has two mobile radios that sell very well, which are TM-990 and TM-991.Many times it is difficult to distinguish between the two products, let me show you the similarities and differences between them.

Similarities:

First,Two Sim Card Slots

Both TM-990 and TM-991 support two SIM cards, which can connect to 4G networks, and can be exchanged for another card if one of them does not work.

Second,FCC Certificated

These two items meet the requirements of the Federal Communications Commission(FCC) to ensure that they do not adversely affect wireless communications.

FCC ID of TM-990:2AKS9TM990.

FCC ID of TM-991:2AKS9TM991.

Third, TM-990 and TM-991 share the same accessory except mounting bracket.

Differences:

First,Size

Width of TM-991 is 65MM and weight is 339g, both of which are less than half that of TM-990, which greatly improves the portability of TM-991 and enables it to be mounted directly on the vehicle via suction mount.

Second, Mounting Bracket

Due to the smaller width of TM-991, its mounting bracket is also smaller than TM-990.TM-991 has one more pair of bracket interfaces than TM-990, allowing for a wider selection of positions.

Third, Secondary Development Pin

TM-990 has an additional 8-pin port at the back , allow secondary development, such as connecting sensors or switches for data transmission and control.

Fourth, Price

TM-991 is economical ones, which have lower price than TM-990.

Fifth, Warranty

TM-990 is two years warranty on the main equipment and one year on the accessories, while TM-991 is one  years on the main device and half year for the accessories.

In general, if you want a lightweight and economical mobile radio, TM-991 is the first choice. If you want to support more features,includes Bluetooth connectivity, then TM-990 is your choice.