... , sound chip 1. 170 sec duration time 2. Built-in direct drive speaker circuit. OTP voice chip ,sound chip, Voice IC--170 ... can be setted to high or low level.*Built-in direct drive speaker circuit.*Operating voltage: DC 2.5V to 3.6V ... sensor, Reversing radar, GSM car anti-theft systems, Central lock actuator, TPMS(Tire Pressure Monitor System)* Home security system, Safely, Burglar ...