Have of this bike Radio expects more. Look and feel of this bike radios very good. Unfortunately, when used in open terrain and on the road too quiet. The volume control does not react until after the half to reach the volume. The unit is in the external operation to leise.Man must constantly put at full volume, something to Verstehen.Dadurch ISR consumption of batteries are extremely high. Conclusion: Excessive Betriebskosten.Schade ...