David Barry's 'Glow Doorbell' is not only aesthetically appealing, but also the best alternative to the traditional electric doorbells. Glow is solar-powered and available in many different and attractive designs.
The wireless doorbell glows on both units when the ouside unit button is pressed and the glow also indicates that the bell is working. The Glow Doorbell even has the ability to send audio and visual alerts, which lets the owner know that someone is at the door.
One of the most interesting features of the Glow Doorbell is that it has two buttons -- one for alerting the parents and the other for children that rings in different tones.