3. Sleep mode: blue LED flashes every 5 seconds4. Charging: red LED light is on5. Charging and connected: red LED flashes slowlyTroubleshooting:The connection of the Bluetooth music receiver is based on the completion of the pairing, and the connection may be interrupted for several reasons:The distance of the device exceeds the range of the Bluetooth connection, or there are other obstacles in the middle (such as: walls, furniture, etc.)One or both of them have been turned off, or it may be because there is no electricity.The connection is not made within the specified time, the device is in sleep mode or the power is off. Turn off the device and reconnect it. Follow these steps:Restart the music receiver and transmitterReconnect after reboot, pairCharge the music receiver and transmitter again