The RPi Relay Board (B) is an expansion board with 8-ch relays for Raspberry Pi. It gives your Pi the ability to control high voltage products such as home appliances.

Features
Standard Raspberry Pi 40PIN GPIO extension header, Supports Raspberry Pi A+/B+/2B/3B/3B+/4B and later versions, Jetson Nano
High quality relays, loads up to 5A 250V AC or 5A 30V DC
Photo coupling isolation, prevent interference from high voltage circuit
Standard rail mount bottom case
Onboard LEDs for indicating relays status
Relay control pin selection jumper, allows to control the relays by custom pins other than the default pins
Reserved control Interface, allows to work with controllers like PLC
Comes with development resources, including examples in wiringPi, bcm2835, python, python-bottle (webpage control), and crontab (cron job)

Specifications
Power supply voltage: 5V
Trigger signal: 3.3V/5V
Relay channels: 8-ch
Contact form: SPDT-NO,NC
Closed current: 6mA (per channel)
Connector: screw terminal block
Dimension: 232 × 72 (mm)
Mounting hole size: 3.0mm

Package Contains:
RPi Relay Board (B) x1
Rail mount bottom case x1
Screws pack x1

For more resources you may need, pls contact me via Amazon message, i will send you then via attachment.