Answer:
The KR500-E operates at 125KHz (up to 10 cm range, 26-bit Wiegand), whereas the KR500-M operates at 13.56MHz Mifare (up to 5 cm range, 34-bit Wiegand). The KR500 form factor is the slim mullion variant (7.8 x 4.4 x 1.6 cm, 50 g), compared to the wider KR501, thicker KR502 (IP64), or longer KR503.
Within the ZKTeco KR Series RFID reader lineup, key differences include:
- Frequency & Output (E vs M): The KR500-E uses 125KHz Proximity technology with up to 10 cm read distance and default 26-bit Wiegand output. The KR500-M uses 13.56MHz Mifare S50/S70 IC technology with up to 5 cm read range and default 34-bit Wiegand output.
- Form Factor vs Sibling Models:
- KR500: 7.8 cm (H) x 4.4 cm (W) x 1.6 cm (D), 50 g (IP65) — narrow door frame / mullion mount.
- KR501: 8.6 cm (H) x 8.6 cm (W) x 1.6 cm (D), 110 g (IP65) — square standard single-gang format.
- KR502: 7.8 cm (H) x 4.4 cm (W) x 2.6 cm (D), 150 g (IP64).
- KR503: 11.6 cm (H) x 7.5 cm (W) x 1.6 cm (D), 120 g (IP65).
