A barometer is, slowly but surely, becoming a regular part of even less expensive drones. It’s task is to automatically hold the altitude of the drone, thus it should keep its height after you let the throttle go.
One of the cheaper drones with barometer is JJRC H11WH. It handles Wi-Fi online video transmission (FPV) from a 2 MPx camera. Besides the remote control, it’s possible to control this quadcopter with a smartphone too. It’s necessary to use the smartphone when you want to record video as well. The battery has the capacity of 1100 mAh and the manufacturer claims it should stay in the air for up to 7 minutes.