WHY CHOOSE KEYESTUDIO!
1.EXCELLENT QUALITY
solder is very clean, everything is aligned nicely, all boards are well packed after function,voltage, current testing
2.COOL YELLOW BLACK DESIGN
The yellow trim is definitely a departure from the standard, dull, black boards, and the yellow silk screen on black mask really pops, making it easy to read the pin labels
3. REALLY SAFE
This board is made from environmental-friendly components and materials, as well as environmental-friendly production technology

Features:
Channel: 4 channel
The relay shield is 5V active HIGH
Contact capacity: AC120V / 3A ; DC24V/3A
Onboard LED indicator for relay output status
Indicator: 4 LEDs are red when the relay is driven high, the corresponding indicator will light up.
Standard interface can be directly plugged into microcontrollers.
Fully compatible with controller R3 board
Power Interface: 5V DC power interface
Indicator LED onboard for Relay output status
Relay 1 (I/O pin 4) is connected to a terminal J4; Relay 2 (I/O pin 5) is connected to J3; Relay 4 is connected to J1.
Be able to control various appliances and other equipment with large current.
3 M3 screw positioning holes for easy installation