This Aeotec Nano Switch Z-wave plus is a true addition to the product portfolio. There also is a version available with power measuring. It's many times smaller than his predecessors (60%), so it is much easier to place. The module has also the possibility for firmware updates "over the air" (OTA), only thing you need for this is the Aeotec USB stick.
Switching can be done up to 10 Amps (+/- 2.300 watts), power consumption of the module itself is 0,8watt. The module can be connected to a toggle switch or momentary switch