1、The smart call is mute and has an indicator light. 2、3.5mm recording interface, you can connect to the computer for recording (computer download recording software). 3、The use of exquisite acrylic panels, strong wear resistance, not easy to break, not easy to corrode. 4、High-definition microphone pickup, high-definition voice calls. 5、Integrated molded panel design for portable mobility. Features: The smart call is mute and has an indicator light. 3.5mm recording interface, you can connect to the computer for recording (computer download recording software). The use of exquisite acrylic panels, strong wear resistance, not easy to break, not easy to corrode. High-definition microphone pickup, high-definition voice calls. Integrated molded panel design for portable mobility. Call in/automatic off-hook selection, ringer switch selection. 16 groups of 8 digits outgoing call inquiry. 52 groups of 8 digits call-in inquiry. 5-digit call area code filtering. 1 digit outgoing code setting. 2-level Volume digital adjustment. 5-level LCD brightness adjustment. Call backlight function and use indicator light. FLASH time 1000ms/600ms/300ms/110ms optional. 16-digit caller ID display (DTMF and FSK caller signals, automatic monitoring). Specification: Size: Approx. 15.5 * 9.5 * 6.5cm / 6.1 * 3.7 * 2.6inch Weight: Approx. 279g Package list: 1 * Host 1 * Antenna 1 * Headset 1 * Audio Cable 1 * Connecting Line 1 * Small Tools Note: Please allow slight error due to manual measurement. Thanks for your kind understanding.