1. Two speed power switch for strong and weak massage 2. In-depth massage of the double heads will more effectively relieve discomfort and renew vitality 3. Streamline design, artistic, tasteful and fashionable 4. Various kinds of silicon rubber heads can be chosen Technical parameters: Rated frequency: 56Hz-60Hz Motor rotation speed: 3,800+_10% Rated voltage: AC 110-230V Rated power: 28W