# Xiaomi LYWSD03MMC ATC or PVVX firmware

Model Id LYWSD03MMC_ATC/PVVX (opens new window)
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 (depending on which LYWSD03MMC firmware is installed)
Encrypted Yes/No - Optional