From the standpoints of price and performance, BlueAnt’s S4 is in the upper middle of this pack—and one of the best Bluetooth visor-mounted speakerphones we’ve yet tested. BlueAnt has developed some nice monaural Bluetooth earpieces in the past, but S4 steps beyond them in terms of design and overall functionality: made from a mix of glossy black plastic, gunmetal metallic plastic, and a matte black metallic speaker grille, S4 has…
