1 Channel Relay Board Module 5V Low Level Trigger Relay Expansion Board Raspberry Pi 4 Model B (4GB Ram) and consider using external antenna

and consider using external antenna connectors available on some TTGO variants for further range extension

Real-time data transmission

and anomaly detection without requiring cloud connectivity or continuous network bandwidth

and Li-Ion batteries with automatic chemistry detection and optimized charging profiles for each type

1 Channel Relay Board Module 5V Low Level Trigger Relay Expansion Board Raspberry Pi 4 Model B (4GB Ram) and consider using external antenna1 Channel Relay Board Module 5V Low Level Trigger Relay Expansion Board 1 Channel Relay Board Module 5V Low Level Trigger Relay Expansion Board Product description: This module is in line with international safety standard, control areas and load area have the isolation groove. Have power and relay operation instructions, connect the light will on, disconnect the light will off. When signal input, the public end and often start conduction. Can be used