Simple security. The Pebble is a powerful yet discreet alarm that's smartly designed as a keychain. Clip it to your keys and enjoy the added confidence of knowing you can produce a 130dB siren if need be. From ila. Includes two keyring alarms with non-replaceable alkaline 1.5V batteries Emits a 130dB siren alarm upon activation Measures 2"L x 1-1/2"W
