This is a nice solution for controlling devices that can’t be directly controlled by I²C bus. The shield form factor enables smooth direct connection with the Raspberry Pi. The shield also has LED indicators show the on/off state of each relay.

Features

• Raspberry Pi compatible
• Interface: I2C,Three hardware SW1 (1, 2, 3) select the fixed I2C-bus address
• Screw terminals on relay
• Standardized shield shape and design
• LED status indicators for each relay
• COM, NO (Normally Open), and NC (Normally Closed) relay pins for each relay
• High quality relays

Specifications

• Compatible: Raspberry Pi 1; Other mainboards via jumpers;
• Power supply: 4.75~5.5V;
• Max Switching Voltage: 30VDC/250VAC;
• Max Switching Current: 15A;
• Frequency: 1Hz;
• Dimensions: 91.20 * 56.15*32mm;
• Weight: 83 g

Links

• Seeed Studio wiki page