# Xiaomi LYWSD03MMC ATC, PVVX or BTHome v2(*) firmware


|Model Id|[LYWSD03MMC_ATC/PVVX/BTHOME](https://github.com/theengs/decoder/blob/development/src/devices/LYWSD03MMC_json.h)|
|-|-|
|Brand|Xiaomi|
|Model|Compact Temperature sensor|
|Short Description|Temperature and humidity sensor compact and cost effective with ATC or PVVX firmware|
|Communication|BLE broadcast|
|Frequency|2.4Ghz|
|Power Source|CR2032|
|Exchanged Data|temperature, humidity, battery, voltage, packet, power, open (depending on which LYWSD03MMC firmware is installed)|
|Encrypted|Yes/No - Optional|
|Image|![LYWSD03MMC](./../img/LYWSD03MMC.png)|

(*) For the BTHome v2 format to be recognised when using the PVVX TelinkMiFlasher the device name must start with the default prefix of "ATC".
