Twine Portable Wi-Fi Sensor Twine listens to your home and contacts you via email, Twitter, text message*, voice call*, or HTTP GET and POST requests. Internal temperature, vibration, and orientation sensors included. Power Twine with 2 AAA batteries for up to 2 months, or use any external microUSB power supply. Simple to set up and use through Twine web app Add external sensors (sold separately) to monitor open doors, moisture, and more