3V Relay High Level Driver Module optocouple Relay Module for Arduino Raspberry Features: Instructions with the signal output; , Signal input port can connect microcontroller IO port, high level signal Double power selection design anti-interference ability is strong, photoelectric isolation protection of high reliability , Current wide detection range:DC0-25V input A diode current protection , Response time is less than 20 milliseconds , Relay long life can absorb 100000 times continuously External connection use spinning crimping terminal, make connection firmer , With fixed installation hole, convenient installation It's brand new, good quality & high performance. Free Shipping & the deliver time to USA is approx. 10-18 days after the shipment date.