Description: 433MHz Long Range Radio from HAC. These small modems use a seamless serial interface - whatever enters the TX pin at 9600bps shows up on the other unit's RX pin. All buffering and error detection is handled internally. And the best part - with 10mW output, it reaches over 500m! This unit can be attached to TTL level serial (for microcontrollers) or directly to RS232 for incredibly simple serial cable replacement! Specifications: Operating Voltage: 3.3V-5.5V 9600bps over 500m Modulation type: GFSK 8 Channels jumper selectable Low power : 30mA RX, 40mA TX, 20uA Sleep Small footprint size: 26x47mm Documents: HAC-UM96 Datasheet (this is a difficult datasheet to read) Tutorial and Translated manual by Dimitri Karatsinides Supported Antennae: Kit comes with 1/4 wave 50Ohm antenna and communications cable! Sold in single units .