> For the complete documentation index, see [llms.txt](https://docs.holybro.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.holybro.com/radio/microhard-radio/overview.md).
# Overview
Holybro Microhard Telemetry Radio integrates a microhard Pico Series RF module, which is capable of delivering high-performance wireless serial communications in robust topologies, such as Point to Point, Point to Multipoint, and secure Mesh (Mesh only available on P900).
It uses frequency hopping spread spectrum (FHSS) technology, providing reliable wireless asynchronous data transfer between most equipment types that employ a serial interface. Fixed frequency is available on the P840 version. The radio is configured using AT commands through the Data port or using the PicoConfig application through the Diagnostic Port.
With the new V2 design, the UART to USB adapter is no longer needed for parameter configuration. A dedicated switch is added to the board for easy mode change between standard data transmission mode to configuration mode.
P900 Radio operates within the 902-928 MHz ISM frequency band, while the P840 operates within 840-845Mhz, and P400 operates within 410-480MHz. You can select your radio based on your country's available frequency band.
### Feature
* USB Type-C port, integrated USB to UART converter
* 6-position JST-GH connector can be directly connected to the TELEM port on various flight controllers.
* High voltage BEC onboard, supports DC7\~35V voltage supply
* UART transmission LED indicator
* Three-stage RSSI LED indicator
* Diagnostic Port LED indicator (Only for P900 V2 and P400 V2)
* Transmission within a public, license-exempt band of the radio spectrum
* Transparent, low latency link rates up to 276 kbps (P900) and 345 kbps (P860).
* Supports a robust true Mesh operation with auto-routing (Not available for P860)
* 32 bits of CRC, selectable retransmission, and forward error correction
* Separate diagnostics port, transparent remote diagnostics, and online network control (V1 only)
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