Garmin chirp

Link to 'Long Description'

Garmin Chirp is a one-of-a-kind wireless beacon designed specifically for the outdoor adventures of geocaching. Affordable, durable and waterproof, chirp can communicate with, and be programmed by, any compatible wireless-enabled Garmin handheld (sold separately). chirp stores hints, multicache coordinates, counts visitors and confirms the cache is nearby. chirp is password protected and has a battery life of up to one year. 
Get And Store Hints chirp can be programmed by any compatible wireless-enabled Garmin handheld to store geocaching hints and other information. When other geocachers arrive near your cache, they?ll be alerted that the cache is nearby, and then they?ll be able to access the hints youve loaded into chirp. And when you return, chirp will tell you how many visitors have been to your cache. 
Set Up a Multicache With chirp, setting up and maintaining a multicache has never been easier. Using your compatible Garmin handheld device, chirp automatically transmits the coordinates so other cachers can find each stage of your multicache. Or if your'e on a multicache, chirp lets you download coordinates. So theres no need to manually enter numerous sets of complex coordinates theres just one simple touch and your'e on your way to the next stage.