Charger and wall-mount in one. The wall transformer serves as an instrument holder and a charger at the same time. Intelligent charging system. The instrument automatically switches off and goes into charging mode when placed in wall transformer. It is impossible to overcharge the mPack UNPLUGGED; the process ends automatically when charging is completed. Simultaneous charging. The charging system charges the battery on the headband as well as an additional single spare battery. Compatible transformer (100 – 240 V). Multi-voltage power supply unit incl. 4 different mains adaptors. Registered Design.