This vibrates not only to the signal to your cellphone, but can also be operated Manually. A lovely soft cock ring connects to small control unit which has a handy belt clip to attach to your clothing out of sight. This unit will automatically vibrate for the length of a call and for a further 20 seconds. Or use manually with 7 great vibration modes available. Imagine your lover out of sight but you can still give him a call and listen to his reaction and know what you are doing to him!