This module is a 5V relay for switching higher currents.
KY-021 Mini Reed-Magnet - SensorKit
JQC3F-05VDC-C KY-019 5V Eine 1 Kanal Relais Modul Board Schild Für
SensorKit - SensorKit
KY-019 5V Relais - SensorKit
5V Relay Module KY-019 (for arduino) - Devobox
KY-019 5V One 1 Channel Relay Module Board Shield For PIC AVR DSP
Sensor Wiki: KY-019 Relay Module - The Geek Pub
KY-019 5V Relay Module - ArduinoModulesInfo
KY-019 Datasheet 5V Relais module
Relay Module KY-019 5V - Page 2 - Raspberry Pi Forums
Tzt Ky-019 5v One 1 Channel Relay Module Board Shield For Pic Avr