Татарская клавиатура is a free keyboard application for Android devices that supports Tatar, English, and Russian languages. With this keyboard, users can easily switch between the three languages and enjoy a smooth typing experience.

One of the useful features of this keyboard is the long-press option on the "layout selection" key, located on the bottom row, far left. This option opens up the device's system menu, allowing users to select from available keyboards installed on their device.

To install the keyboard, users can go to Menu -> Settings -> Locale & text. In the text settings, check the box next to the installed keyboard. Then, in any input field, such as messages, tap and hold the input area. This will open up the Input Method menu, where users can select the desired keyboard.

Overall, Татарская клавиатура is a convenient and easy-to-use keyboard application for those who need to type in Tatar, English, and Russian languages.