eSecurityProducts - Some keywords here

Typical Maximum Read Range
ProxCard® II Card - up to 9" (22 cm)
ISOProx® II Card - up to 8" (20 cm)
DuoProx® II Card - up to 8" (20 cm)
Smart ISOProx® Card - up to 8" (20 cm)
Smart DuoProx® Card - up to 8" (20 cm)
HID Proximity and MIFARE® card - up to 8" (20 cm)
ProxCard® Plus Card - up to 4" (10 cm)
ProxKey® II Keyfob - up to 4" (10 cm)
MicroProx® Tag - up to 4" (11 cm)

*Depending on local installation conditions.

Dimensions
5.00" x 5.00" x 1.00" (12.7 x 12.7 x 2.54 cm)

Power supply
5-16 VDC
Linear power supplies are recommended.

Cable Distance
Wiegand interface: 500 feet (150 m)
Clock-and-Data interface: 50 feet (15 m)
Recommended cable is ALPHA 1295 (22 AWG) 5 conductor minimum stranded with overall shield or equivalent. Additional conductors may be required for LED or beeper control.

Current Requirements
Average: 25 mA at 12 VDC
Peak: 125 mA at 12 VDC

Operating Temperature
-22° to 150° F (-30° to 65° C)

Operating Humidity
0-95% relative humidity non-condensing

Weight
13.6 oz. (385 g)

Certifications
Canada/UL 294 Listed
FCC Certification, United States
Canada Certification
CE Mark
EU and CB Scheme Electrical Safety (EN60950 and IEC60950 ITE Electrical Safety)
Fifteen EU Countries under the R&TTE Directive (EN300 330 - SRD, and ETS 300 683 - EMC)
Australia C-Tick (pending)
New Zealand (pending)
Taiwan (pending)