Check the listing for details. Dark Grey Pencil Tags AM 58kHz per 100 (Compatible with Sensormatic systems). Condition: New. Listed at 31.50 USD. These will work with nearly all Sensormatic systems and ALL 58khz am systems. Frequency: 58kHz AM. choose your amount from 100, 500 and 1,000. Detacher type required is: Superlock I have for sale for an extra £40, AS SEEN IN THE LAST PHOTO!