1pcs Vishay TSOP4838 38kHz Carrier Frequency IR detector module Elliptical lens helps block light noise from above and below the center frequency of 38kHz. Low-voltage operation Great for Arduino Uno and Raspberry Pi Remote Control Receiver projects TSOP4838 Through Hole Mount IR Receiver Module 38 KHZ Wave Length/Frequency1pc Vishay TSOP4838 38kHz IR detector module Customer Questions & Answers