How many devices can I connect via Bluetooth at one time?
There can be only 1 active pairing at a time.
Support Type: A5+ Wireless Speakers|Frequently Asked Questions
Why do I hear my phone’s notifications over Bluetooth?
Your Bluetooth connection works by projecting the sound from your phone. So, if your ringtone volume is on, that sound will come through Bluetooth too. This is a simple fix by changing the phone’s ringtone settings to either vibrate or silent.