Compact， stable and convenient to use， our DR103 Door Access Control System RFID/EM Card Reader will surely bring plenty of convenience to your daily access control. It is featured with perfect protective circulation - anti reverse wiring and 1000V surge protection， h 2000V ESD protection on the output port and 100m communication range. Moreover， you can parallelly install 2-4 card readers without suffering from any bad affection. Also allowing external control of LED and buzzer， this card reader really goes beyond your expectation!                                    Features             Compact， stable and convenient to use<br> With perfect protective circulation - anti reverse wiring and 1000V surge protection<br> With 2000V ESD protection on the output port<br> Provide up to 100m communication range<br> Can parallelly install 2-4 card readers<br> Allow external control of LED and buzzer <br>                                                            Specifications             Model     DR103    <br> Color     Black    <br> Material     PCBA + Plastic Housing    <br> Quantity     1 Set    <br> Battery Included or Not     No    <br> Power Adaptor     No    <br> Dimensions     (3.19 x 1.69 x 0.71)" / (8.1 x 4.3 x 1.8)cm    <br> Weight     2.96oz / 84g       <br>                                                             Package Includes            1 x Reader (20cm Cable)<br>1 x Instruction<br>2 x Screws<br>