There are 3 ways to use your Boombottle H2O+ 

1 speaker and 1 device
2 speakers and 1 device
1 speaker and 2 devices

To pair your BoomBottle H2O Plus to 1 speaker and one device -
• Press and release the Multi-Function Button to turn on the H2O Plus.
• A tone prompt will sound
• Press and hold the Multi-Function Button for 3 seconds and then release
• The Bluetooth indicator will flash blue and red alternately with one sound prompt.
• Go to your devices settings menu and turn Bluetooth on to search for the H2O Plus
• Select H2O Plus from the list of available devices
• A sound prompt will notify you of a successful connection.
• Don’t forget to adjust the equalizer settings to indoor or outdoor based on your environment or sound preferences.

To pair your BoomBottle H2O Plus to 2 speakers and 1 device -
• Power on both H2O Plus at the same time by pressing and releasing each unit’s Multi Function Button.
• Open the waterproof cover and press the dual pairing button on both speakers at the same time.
• There will be a sound prompt indication they are in pairing mode followed by a second sound prompt indicating that they paired to each other
• Press and hold the Multi-Function Button on one H20 Plus for 3 seconds and release. (Note that the H2O Plus that pairs to your phone is defaulted to the left channel.
• There will be a sound prompt indicating that the unit is in pairing mode.
• Go to your devices settings menu and turn Bluetooth on to search for the H2O Plus
• Select H2O Plus from the list of available devices shown
• A sound prompt will notify you of a successful connection.
• The two speakers are now paired with one speaker acting as the left channel and the other acting as the right.

To leave dual-pairing mode and play only one speaker
• Turn off one of the units my pressing and holding the Multi-Function Button for 5 seconds. Note that both speakers will turn off.
• Restart on of the speakers and pair it to your device.