We have now been using our SENA Bluetooth bike to bike microphones and headsets for about a week on this tour and we are increasingly impressed with them.
SENA is an American company who produce these devices for motorcycle use. However, they adapt easily and very successfully for use with bicycles. The units are feather light and attach securely to bike helmets with small Velcro pads. The battery packs, control units and mikes are easily accommodated. The speakers take a little more ingenuity to fit, but we have found that they stick well enough to cycle helmet straps with their built in hook and loop backs.
We had feared that they might be annoying to wear all day on a ride, but far from it. We simply do not notice the weight. The mike stalks bend to sit just off the face and go totally unnoticed in use.
Their best feature is the sound quality however. Voice communications come over in crisp clear stereo. SENA claim a range of 900 meters. In our experience they work well up to about perhaps 500 meters. From about that point you get a bit of hiss and crackle. Under normal use, say at 20 bike lengths, sound quality is excellent.
Battery life is good. The units will hold out for up to eight hours of constant use at a time. A full charge is needed overnight, each night however.
The units are not cheap, but bought carefully online the dual pack is good value for a device that has transformed our touring together experience. We are big converts and can’t imagine going back to shouting at each other!