Detailed Product Description Features: 1) Material: steel 2) Size (W x H x D): 321 x439 x 155mm 3) Fingerprint sensors: optical 4) Response time: 0.5 - 1 second 5) Capacity: 75 prints (5 prints for master) 6) Battery: 1.5V x 4 7) Battery power supply supports 3,000 operations 8) Any colors are available Packing: Carton