Customizable cards for student and instructor recording are compatible with virtually all Caliphon® standard card reader/recorders. Other compatible models include: Eiki, all models; Audiotronics #800 Tutorette; TTC, models AQR4 and AQR3; Electronic Futures, models 101 and 102; MCM Skillmaster; Califone 4400, 4450 and Audioteque. Box of 100.