Belkin’s iOS-friendly WeMo home automation line took another big step forward today with the announcement at CES in Las Vegas of a new line of sensors.

For those who want to create a subscription-free security system, the new devices are just what the doctor ordered.

The sensors are battery-powered with a one-year battery life, perfect for easy installation by anyone.

Pricing at this time is undetermined, and Belkin says that the new products will arrive in the second half of 2015.

First up is the WeMo Door and Window Sensor, which is a magnetic contact switch used to determine if a door is opened or closed.

This is perfect for making sure that doors and windows are closed when leaving the house, or for setting up rules to automate other processes when a door or window is opened or closed.

Need to find out if a specific window or door is open or closed? Just use the free WeMo app to find out.

Next is the WeMo Keychain Sensor, a keychain fob that tells the system when someone arrives at or leaves a home. A button on the sensor can be set up to control any other WeMo device when pressed – perfect if you’ve set up a WeMo Maker Switch to open your garage door.