Wirelessly connected to your cell phone, the small, customizable Ditto Vibrating Notification Device, which is clipped onto whatever you're wearing, can immediately alert you through vibration of incoming calls, texts, emails, appointments, etc. The device is battery-operated, has no button or cables, is reportedly waterproof, and has a "digital tether" that will remind you if you've forgotten your phone. Pre-identified senders (such as a spouse or boss) can be assigned a specific number of vibrations, thus allowing the wearer to know who is contacting them without having to check their phone. It is especially useful for the hearing impaired.