The Pill by Shelly WiFi BT

Main features
Compact design, USB-C powered (5V), Dual connectivity (WiFi & Bluetooth)
Plug and play: Temperature monitoring (DS18B20/DHT22)
Advanced peripheral modes - Digital Input/Output; Analog input (Voltage meter);
External Peripheral Add-ons: SSR Dual-channel, Analog Voltage measurement (0-30V)
Shelly Gen3 capabilities (Local actions, Schedules, Scripting, Virtual components) 
Bluetooth Gateway for Shelly BLU devices
3rd party integrations-ready (MQTT, WebSocket, HTTP)
Peripheral modes - Temperature (DS18B20) - Supporting up to 5 x Temperature probes (DS18B20); + optional 2 Digital IO
Temperature & Humidity - 1x Temperature & Humidity sensor DHT22 + optional 2 Digital IO
Analog Input - Analog sensor input (voltmeter) + optional Digital IO. Measured Voltages: 0-2.5 V (default); external Add-on for 0-30V
Digital Input/Output - configurable for up to 3x Inputs/Outputs ; Digital IO: 3.3 V Logic Levels; Digital input: Active Low (default).
Solid State Relay Add-on - Peripheral Addon with 2x channels galvanic-isolated outputs (max 30 V / 300 mA) + optional Digitial IO
* Note: Digital I/O can be combined with all modes and setup independently as Input or Output

Use cases
Water Temperature Monitoring - Track temperature of pools, aquariums, water tanks and reservoirs with simultaneous monitoring of up to five temperature points, using external temperature sensor probes (DS18B20)
Temperature and Humidity Monitoring - Monitor temperature and humidity in a room, server cabinets, greenhouse, warehouses or other areas where keeping optimal environment condition is necessary, with the supported external sensor DHT22
Digital Sensors Readings - Connect simple digital sensors like door reed, motion, water state sensor to your home automation system
DC Voltage monitoring - external Add-on available
Monitor DC voltages up to 30 V with the external Analog 0-30 V Add-on, suitable for tracking voltage across various battery systems (3.7 V, 12 V, 24 V) or other DC power lines. 
Analog Sensor measurements - external Add-on available
Analog sensor voltage measuring for popular hobby & industrial analog sensors with the available Analog 0-30 V Add-on
Control DC Loads - external Add-on available
Dual-channel control for small DC Loads up to 30 V / 300 mA like led indicators, small fans, solenoids, valves and etc. with additionally available external SSR Add-on
External Systems Control - Available Digital Input/Outputs allow switching and reading state of external controllers and systems (3.3V logic level). The optionally available SSR Add-on allows triggering inputs of external controllers (max 30 V / 300 mA).