The SM series includes relatively inexpensive membrane keyboards with a low key stroke in the style of laptop keyboards. Usually, membrane switches have a "full stroke" with a length of 3.5 – 4 mm, when the key is pressed until it reaches the elastic membrane layer, then returns it to its original position. In the case of Defender SM models, we are talking about a stroke length of 2.5 – 3 mm, which, according to the manufacturer's logic, has a beneficial effect on the speed and convenience of printing.


Given the low profile in the production of these keyboards, the company's engineers most often leave their choice on island-type keys, which look neater than classic buttons, but are more difficult to clean. Additional functions of SM keyboards are most often limited to multimedia keys and an optional armrest. As for the connection, the most popular option is a regular USB cable, but occasionally wireless models a la Defender SM-535 flash in this series.

Perhaps the most interesting keyboard in this line is the damn stylish Oscar SM-660L Pro model. We recently saw the same chassis in the MSI Interceptor DS4100 and Redragon Karura 2 models. The Defender variant, in our opinion, looks more interesting due to the use of strict black plastic and monochrome blue backlight, which give it a strict and predatory look at the same time. It uses a membrane base with low-set keys, and the case is equipped with a handstand and covered with non-slip softtouch material.