UCEC XY-MK-5V / XY-FST 433Mhz Rf Transmitter and Receiver Module Link Kit for Arduino/Arm/McU/Raspberry pi/Wireless DIY(6-pack) TX Working voltage: 3V-12V. Working current: 20-28mA. Resonance mode: sound wave resonance (SAW) Modulation mode: ASK /OOK RX Working voltage: 5.0VDC. Static current:4MA Working principle: single chip superregeneration receiving