User Capacity: 200, Verification Mode: 1, Voice Indication: Doorbell and Display Highly Performance Fingerprint Sensor, USB Emergency Power Interface (5-6V) 4 x 1.5V alkaline Batteries Suitable for glass door thickness 8-12 mm, Door Gap Required: 0.8 - 1 cm, Low Voltage Alarm: < 4.2V, Working Temperature: -20°C ~ +60°C, Working Humidity: < 93%
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