The Scosche MotorMouth II stereo has an interesting and unique Bluetooth speakerphone form factor. Blending the size of an in-ear hands-free kit, the open-air functionality of a speakerphone, and the interoperability with a car's stereo of an installed solution, the Scosche MotorMouth II is unlike anything we've ever tested. However, the unique nature of the MotorMouth II's design is both its biggest strength and most obvious weakness, as the gracefulness of its implementation lives and dies by the configuration of the host vehicle's dashboard.
The MotorMouth II is essentially a small Bluetooth microphone with a 3.5-millimeter male headphone-type connection jutting out of one end at a 45-degree angle. From within a transparent plastic ring between the microphone head and the body of the unit shines an LED indicator that shines blue to indicate an incoming call or connection status, shines red to indicate low battery or charging status, and alternates red and blue to indicating pairing mode. On one side of the unit is a multifunction button that is used to power the device on and off, answer and end calls, and activate the paired phone's voice-command function--if available. The idea is that users will be able to plug the MotorMouth directly into their vehicle's auxiliary input (preferably dashboard-mounted) to take advantage of their vehicle's speakers for hands-free calling. It's a simple idea, but also an effective one that we're surprised that no one had thought of until now.
The MotorMouth pairs with a Bluetooth-enabled phone quite simply with a four-digit PIN--although some users may find it confusing that the device identifies itself by its BTAXS model number, rather than the more easily recognizable MotorMouth moniker. Once paired, the device can be used for hands-free calls, but we were also pleased to find that the MotorMouth II supported A2DP audio streaming--a huge bonus for a wireless device that will spend most of its lifetime occupying a car stereo's audio input. Users interact with the MotorMouth II via a series of taps and long presses of its single button, which is simple enough for single calls, but it can get a bit confusing when attempting to juggle a pair of calls through call-waiting.
The microphone itself utilizes DSP echo cancellation, so you won't have to worry too much about your callers hearing themselves, but road noise can be a bit of an issue depending on how well-insulated your vehicle is and the final placement of the MotorMouth II in the cabin. Callers were aware of the fact that our test calls originated from a moving vehicle, but they almost never complained about not being able to hear us properly. Of course, with four speakers pumping out our end of the call, we heard our side of the conversation loudly and clearly.
Along the spine of the unit is a tiny pinhole connection for the included USB charging cable adapter. We're not a fan of such proprietary connections, as they make finding replacement chargers and cables difficult. The MotorMouth II also ships with a low-profile USB-to-12-volt adapter for charging in-car. Scosche claims a combined 5-hour talk and audio streaming time or standby time of up to 150 hours from a 2-hour charge.