Stem Shield for your Arduino, the Velleman.

When you assign a high level to the module pin, the electro magnet can suck magnetically conductive objects. Otherwise, it will release the object.

An electro magnet is a type of magnet in which the magnetic field is produced by electric current. An electric current flowing in a wire creates a magnetic field around the wire, due to the Ampere Law. To focus the magnetic field on an electro magnet, the wire is wound into a coil with many twists of wire side by side. The Magnetic Field of All Twists of the Wire passes through the Coil Center, creating a Strong Magnetic Field there.

It's Easy to Use to Learn the Electro Magnet Principle.

The Module KA2284 is a Battery, Power and Audio Level Indicator.

The Portable Magnetic Magnetic Portable Locator has a GPS tracking function so you can locate your vehicle accurately and in real time. Simply connect the SIM to the device, so you can track your vehicle in real time over the Internet.

In/Out Shield for your Arduino, Velleman.

Special for garden lighting, this Transmitter and Receiver Kit with 2 Channels allows you to switch the lighting of your Garden in 2 different zones with the commands on and off.