VB4 is not compatible with action cameras because their length is not enough to have them mounted firmly in the adapter while using. Also, they could not be balanced before switching VB4 on due to the lighter weight.
If you want to mount action camera on the VB4, please try to find third party mounting plate as shown below, and put them together on the VB4.

VB4 uses a built-in rechargeable battery with a capacity of 1300mAH and a working voltage of 6.8V-8.4V.

When the battery is fully charged, the static horizontal battery life is 6.5 hours (with a load of 205g, tested in the laboratory).

NOT waterproof.

There are 1 / 4 inch screw hole on the bottom base of VB4, which can be compatible with all the accessories with the 1 / 4inch screws, such as tripod, extension rod, etc.

It can be used with fill light or AI tracking module to realize object tracking, Only one of them can be used at a time. (does not support powering mobile phones).

It can be equipped with fill light or AI tracking module.

Find USB cable provided to connect to the USB port on VB4 handle, and connect the other end of USB cable to charger adapter (not included, mobile charger adapter is compatible).
Please note: VB4 does not support quick charger.
Charging the battery with 5V/2A output adapter , it will take around 2.5 hours. The indicator is solid yellow while charging. When the battery is fully charged, it turns to green.

Please install and balance the smartphone with gimbal properly, and make sure the smartphone is already closest with the phone adapter, please keep the clip with Logo facing up.

Press and hold the power button for about 2~3 seconds, the axial indicator lights will turn on from left to right, and the boot is successful when you hear the prompt sound, and then release the button.

Please make sure that the back of the phone fits the clip after the phone is mounted on the clip and balanced.

1. Low battery:
-The red light is flashing, and the stabilizer will be turned off after the sound alarm prompts.
2. Protection mode:
-If "Handle Free Protection" is detected, hold the handle or fix it on a tripod.
-If the motor temperature is too high (60°C) or there is overload protection, avoid turning on the device without load or using it for a long time with an unbalanced center of gravity.
-Vibration protection alert: The phone is not properly installed or has been removed.

Please turn the gimbal on and upgrade the firmware by App again. When upgrading, please make sure the gimbal is always on, and keep the phone on the App interface.

Please try the following steps:
1) Forget the device or cancel pairing in the Bluetooth settings of smartphone, close the Bluetooth of smartphone and open it again, making sure the Bluetooth signal of gimbal is not connected in the smartphone's Bluetooth settings.
2) Please reboot the gimbal, and run the Feiyu On App to connect again.

1) Please make sure Portrait Orientation Lock in iPhone were turn off, kindly see the picture below.
2) Please make sure you were paired the Bluetooth with Feiyu On App properly.

1) Make sure the battery for the gimbal is not ran out off.
2) Do not charging the gimbal’s battery during the upgrade process.
3) Do not turn off the App during the upgrade process.
4) Do not turn off the gimbal during the upgrade process.

The function of joystick is to control rotation of smartphone in four directions.

The speed or directions of joystick could be set up in Feiyu On App. Below is the interface in the App for your reference:

The Android version of Feiyu ON APP currently does not support recording 60FPS videos under 4K resolution. It is recommended to use the phone's stock camera for recording 4K60FPS videos after pairing the Bluetooth between gimbal and the phone.