Meet the RoboMing Telepresence robot: a 2-wheel self-balancing robot that lets you attend meetings at remote locations, monitor your home, and stay in touch with your loved ones. All you need is download its app from the App Store, connect WiFi/Bluetooth, and use an iPad as its head. The height is adjustable from 120cm to 150cm.
The robot has built-in obstacle-avoidance. The battery lasts up to 8 hours. You can find it here.