Smartphone stabilizers keep getting more sophisticated all the time. The Zhiyun Smooth II is a handheld gimbal stabilizer for smartphones up to 6.4 inches. It features 360-degree rotation along the pan axis. It can be wirelessly controlled via iOS and Android devices or using a Bluetooth remote.
Smooth II runs for 5 hours on battery. It features short-circuit, reverse, and over-discharge protection. The device has vertical shooting and a panorama mode too. This video shows how its face tracking feature works.