We paired the M1 with the LG Chocolate 3, which has stereo-Bluetooth support. Sound quality was fantastic. The M1 has an internal subwoofer with 28-watts RMS output, which helped in creating a really loud maximum volume as well as a pretty decent bass output, especially with the bass-boost mode turned on. It made our tiny little MP3 sound so much richer than it did on the cell phone. Do note that the M1 has an operating range of 10 meters.
While we would've liked a removable battery, or maybe an option to use regular alkaline batteries when a wall outlet isn't in sight, we think the M1 lived up to our expectations overall. The BlueAnt M1 stereo-Bluetooth speaker has a rated playback time of 3 to 4 hours on high volume and 10 hours on medium volume. It has a rated standby time of 62.5 days and a charging time of 3 hours.