Vobot Clock have four color LED and they indicate as below:

Network instability

1. Please try to reboot your Vobot
2. Update the firmware for your router or modem hardware.
3. Get your Vobot closer to the router
4. Try to setup the Vobot again.
5. Reduce Wi-Fi congestion

Unable to sign-in Alexa Voice

1. Try to reboot your Vobot

2. Cancel the authorization of alexa and then authorize it again. (Please refer to Why cannot play Amazon Prime Music? to see the authorization process)

3. Make sure that your network is stable