Four different massage heads: The massager is equipped with four different shapes of massage heads to help the user relax different parts of the body. AC Charger: 7.4-12V: 1 amp Pulse: (impact per minute)/frequency (Hz): Level 1 – 1800 rpm/30Hz Level 2 – 2400rpm/40Hz Level 3 – 3200 rpm/53Hz Weight: 1.1 kg (1.4 kg including charger)