?This is Security ID Card Intelligent Electronic Lock System 8821-QG. It made of high-quality material of aluminum. It's easy to install and operate. Fit for modern offices£¬ office buildings£¬ residential apartments£¬ villas£¬ etc. Good choice for you!                                    Features                New and high quality<br>    Made of high-quality material of aluminum<br>    Easy to install and operate<br>    Low voltage alarm<br>    Fit for modern offices£¬ office buildings£¬ residential apartments£¬ villas£¬ etc<br>    If the voltage of batteries is less than 4.8V£¬ it will make 3 sounds and red LED lights when you open the lock. In the meanwhile£¬ the lock can be opened more than 50 times<br>    Required Thickness: 36mm - 55mm<br>                                                            Specifications                        Card Type     Cards of different shapes of EM 4100 chip    <br>          Inductive Distance     0 - 3 cm    <br>          Working Voltage     DC 6V£¬ NO.4 alkali battery. It can be used more than 1 year in normal state    <br>          Static Power Supply     &#60;15uA    <br>          Card Reading Supply     &#60;20mA    <br>          Lock Opening Supply     About 300mA (last for 0.3s)    <br>          Operating Temperature     0&#8451; - 70&#8451;    <br>          Humidity     &#60;95%    <br>          Color     Golden    <br>                                                             Package Includes                1 x Security ID Card Intelligent Electronic Lock System 8821-QG<br>    1 x 3 x Key<br>    1 x 2 x Induction card<br>