CY-RFT8 EM clamshell card Pre-Printed With Sequential Serial Number Product specifications Product Features Short range detection Compatible with CY-MF01 reader Clamshell Encapsulation No battery required Specifications Frequency BandOperating FrequencyOperating TemperatureChipSupported ReaderRead distanceTransmission ModeData RetentionShell MaterialColorFinishCard SizeDimensionsWeightlow frequency (LF)125 KHz-10°C ~ 70°CEM4100EM Proximity Reader (CY-EM01)1 ~ 3 CMPassive (battery-free)> 10 yrsABS (PVC surface Layer)WhiteMatteCR8085.6 x 54 x 1.8 MM10 G