• Caller ID: support
• Voice prompt: support
• Chinese and English voice: support
• One drag two: support
• Pairing timeout shutdown: Pairing status for 5 minutes after shutdown
• Low reminder: When the voltage is less than 3.2V to remind, every 5 seconds to remind 1, 3.1V shutdown

system status:

• Power on: MFB long press 3 seconds
• Volume Plus: Short press VOL +
• Volume down: short press VOL-
• Toggle the language: Double-click to hold down the MFB in the pairing state (red and blue)

Music control:

• Play Pause: Short press MFB
• Previous song: VOL-long press 2 seconds
• Next song: VOL + long press 2 seconds

Phone control:

• Answer: Short press MFB when calling
• Reject the call: press MFB when making a call
• No. Redial: Double-click the MFB key, then press MFB to cancel the dial

led lights show:

• Boot pair: red and blue lights alternately flash
• Connection status: blue light slow flash (5 seconds 1 down)
• Low voltage: red light flash (0.5 seconds 1 down)