The great thing about all-in-one devices is the way that they reduce both clutter and the bulky, pants-sagging weight caused by having a gadget for each function. Smart Keychain is one such device that combines a key-finder, a flash drive, and an email reader into a keyring display with a USB port. At the same time, the low-tech look and feel of the product and the bulky addition it makes to any keyring detracts from features mostly offered by the phone that isn’t being ousted from the pocket. There are some really good tools here, but this feels like an unnecessary reinvention of the beeper. Smart Keychain is available for $59.