This SY601A11 2.4G Digital Wireless Non-visual Intercom System Door Bell adopts 2.4G ISM digital frequency hopping and encryption technique. Its transmitting power is less than 100MW. Besides, it adoptsAFH adaptive FM technology to ensure powerful function. This digital wireless door bell featuresstrong communication confidentiality, clear voice, wireless remote unlocking, energy-saving and longcommunication distanceadvantages. 2.4G wireless digital transmission intercom signal is stable and strong to make sure excellent communication effect. It is easy to install without arranging wire. This product is suitable foroffices,villas, courtyard and unit family etc.<!--Features --><p>FEATURES</p><UL><LI>Adopt 2.4GHz ISM digital frequency hopping and encryption technology</LI><LI>Barrier-free communication distance is up to 300 meters</LI><LI>Fine anti-interference ability and clear sound</LI><LI>Outdoor unit adopts touch button, power-saving, generous and elegant</LI><LI>With rain-proof cover to protect its lifespan</LI><LI>Handhold indoor unit with exquisite base is beautiful and practical</LI><LI>Indoor unit features ring reminder and flash reminder for deaf or dumb people use</LI><LI>Indoor is designed with unlocking button, support wireless remote unlock</LI><LI>Both indoor and outdoor unit use the high capacity BL-5J lithium-ion rechargeable battery</LI><LI>Outdoor unit supports 2 ways unlock mode: power-on unlock or power-off unlock</LI><LI>One outdoor unit is able to simultaneously match with 3 indoor units</LI></UL><!--Specifications --><p>Specifications</p><TABLE class=ke-zeroborder border=1 cellSpacing=0 cellPadding=0 width="80%"><TBODY><TR><TD width=131>Material</TD><TD width=365>ABS</TD></TR><TR><TD width=131>Working Frequency</TD><TD width=365>2.4KHz</TD></TR><TR><TD width=131>Battery Work Voltage</TD><TD width=365>3.4V-4.1V</TD></TR><TR><TD width=131>Battery Charge Voltage</TD><TD width=365>5V</TD></TR><TR><TD width=131>Battery Charge Current</TD><TD width=365>200mA (TBD)</TD></TR><TR><TD width=131>Indoor Unit Standby Current</TD><TD width=365>Approx 2mA</TD></TR><TR><TD width=131>Indoor Unit Work Current</TD><TD width=365>90m(TBD)</TD></TR><TR><TD width=131>Outdoor Unit Standby Current</TD><TD width=365>approx10mA</TD></TR><TR><TD width=131>Outdoor Unit Work Current</TD><TD width=365>110mA(TBD)</TD></TR><TR><TD width=131>Work Temperature</TD><TD width=365>-10-70 Degree</TD></TR><TR><TD width=131>Work Frequency</TD><TD width=365>2400MHz-2483MHz</TD></TR><TR><TD width=131>Transmission Power</TD><TD width=365>18dbm(TBD)</TD></TR><TR><TD width=131>Sensitivity</TD><TD width=365>-90dB</TD></TR><TR><TD width=131>Remote Distance</TD><TD width=365>300m</TD></TR><TR><TD width=131>Audio Rate</TD><TD width=365>16K</TD></TR><TR><TD width=131>Audio Digits</TD><TD width=365>16 Digits</TD></TR><TR><TD width=131>Time Delay</TD><TD width=365>Approx 16m/s</TD></TR><TR><TD width=131>Total Harmonic Distortion</TD><TD width=365>-60dB</TD></TR><TR><TD width=131>S/N Ratio</TD><TD width=365>90dB</TD></TR><TR><TD width=131>Frequency Response</TD><TD width=365>500Hz-10KHz</TD></TR><TR><TD width=131>Working Temperature</TD><TD width=365>-20-60 ▲C</TD></TR><TR><TD width=131>Indoor Dimension</TD><TD width=365>(5.91 x 3.74 x 2.17)" / (15.0 x 9.5 x 5.5)cm (L x W x H)</TD></TR><TR><TD width=131>Outdoor Dimension</TD><TD width=365>(6.69 x 1.97 x 1.18)" / (17.0 x 5.0 x 3.0)cm (L x W x H)</TD></TR><TR><TD width=131>Weight</TD><TD width=365>15.87oz / 450g</TD></TR></TBODY></TABLE><!--Package Includes --><p>Package Includes</p><UL><LI>1 x Indoor Unit</LI><LI>1 x Outdoor Unit</LI><LI>2 x Batteries (BL-5G)</LI><LI>2 x Chargers</LI><LI>1 x Manual</LI><LI>1 x Screw</LI></UL><!--Extra Info --><!--produts_compatibility -->