1. Auto-reconnection on Power-on / Auto-reconnection on Exiting Sleep Mode
With Dual Connection enabled:
a) When the headphones are powered on and no 3.5mm aux-in cable is inserted, headphones will attempt to reconnect if the number of connected devices is less than two. The reconnection targets the last two devices the headphones were connected to. If the headphones are enabling Dual Connection for the first time and have no prior reconnection records, they will maintain a single-device connection. (In single-connection mode, the headphones will not enter pairing mode automatically; pairing with a new device requires the user to manually press and hold the Bluetooth pairing button.) If the headphones fail to reconnect to other devices, they will remain in single-device connection mode and will not enter pairing mode.
2) After the headphones and your device are disconnected due to exceeding the connection range, the headphones will only reconnect to the phone that was disconnected due to the out-of-range issue if it comes back within the connection range again.
3) The headphones won't trigger reconnection when they are in a call or playing music.
4) If the headphones are in the reconnection state and simultaneously in a call or music playback, they will pause the reconnection within 5 seconds. If the call or music playback ends within the reconnection timeout period, the headphones will resume the paused reconnection until the reconnection times out. After the reconnection times out, the connection to the headphones can only be initiated from the device side.
2. Connection Preemption
When the headphones are in Dual Connection mode, they support connection preemption. The following rules apply when connection preemption occurs:
a) If neither of the two connected phones is in music playback state, the headphones will disconnect from the first-connected phone and connect to the device initiating the preemption.
b) When the headphones enter pairing mode with a new device:
If two devices are already connected, the headphones will disconnect from one of the devices upon entering pairing mode. After disconnecting from one device, the headphones can be detected and connected by the new device.
c) If the headphones are already connected to two devices, and a third device (with a previous connection record) initiates a preemption request, the headphones will disconnect from one of the two currently connected devices. After the disconnection, the third device can preempt and connect to the headphones.
Tips:
Music playback:
1) If one of the two connected phones is in music playback, the headphones will disconnect from the phone that's not in music playback state and connect to the device initiating the preemption.
2) If both phones are in music playback state, the headphones will disconnect from the phone whose music is not outputting through the headphones (i.e., disconnect from the device where music playback is muted) and connect to the device initiating the preemption.
Call state:
If either of the two connected phones is in a call, connection preemption is not allowed.