1- Switch On / Off and Bluetooth Pairing

• Power on: long press left & right MFB 2 seconds, blue light flashed 1s. (Voice prompt “power on”)
• Power off: long press left or right MFB 4 seconds, blue light flashed 1s. The left/right temples will turn off simultaneously (Voice prompt “power off”).
• After power on, it will automatically enter the pairing mode (Voice prompt “left channel, right channel”), after pairing successful, the and blue light on the master will flash alternately, slaver temple blue light flash slowly.
• Turn on smart phone Bluetooth to find “S21” for pairing connection (voice prompt “connected”), after connected the master temples blue light flash slowly.
• During connection, if smart phone over the Bluetooth distance or disconnect Bluetooth manual, smart glasses automatically enter the pairing mode (voice prompt “disconnected”), If there no Bluetooth pairing within 5 minutes or the new Bluetooth device or pairing failed, it will automatically turn off.
• If you have connected to multiple devices, and did not cancel the Bluetooth pairing, the recently connected device will be selected first, only one device is allowed to pair and connected, if connect new device, must disconnected the currently device.

2- Audio Mode

• Volume: double-click the right temple MFB to volume up, and “beep” at the maximum. Double-click the left MFB to volume down.
• Play / Pause: one tap the MFB on the either side temples.
• Voice Assistant / Siri: Long press the right temple MFB for 2 seconds.
• After the music is paused for 1 minute, it enters the standby state, and the blue light flashed every 5s (it can be activated by one tap the MFB)

3- Call Mode

• Answer the call: one tap and side MFB
• Hang up the call: One tap any side MFB
• Reject phone call: double click any side MFB
• Answering new call during calling: one tap any side MFB.

4- Charging Mode

• Full charging time 1.5 hours, red light flashed slowly, and completed with red light off but blue light on.
• Low battery alarm voice prompt “battery low”, alarm interval 60s, red light flashed twice.
• Unable power on during charging.