This ultrasonic proximity tag comes attached to a keychain and is supplied with a pre-assigned unique code.

• Range: 5cm-10cm (1.97"-3.94")

• Waterproof

• Shock proof

• Uses ultrasonic connection

• Each tag has a unique pre-assigned code (8 digit number) printed on the back

• Dimensions: 39mm x 35mm x 7mm (1.54" x 1.38" x 0.28").