Fangrui Product Details 1. Supply Voltage 3.2v - 5.5v. (if You Want To Work In The Module Launch State For A Long Time, It Is Recommended When The Supply Voltage Exceeds 4.5v Series With A 1n4007 Diode, To Avoid Heating Module Built Ldo) 2. Default Communication Distance (open Test): About 600m (adjustable To Achieve The Maximum Communication Distance Of 1000m, The Air Baud Rate 5000bps). 3. The Default Idle Current: 16ma (modules In Different Operating Current Of The Different Operating Modes). 4. Operating Frequency Range: 433-473.0mhz, Up To 100 Communication Channels. Maximum 100mw Mit Power (can Be Set) 5. The Module Supports Software Upgrades. The Default Factory Settings: Operating Mode Fu3, Baud Rate 9600bps, Communication Channel Ch001 (433m). Colour:blue Material:plastic Size:27.8 X 14.4 X 4mm Package Contents: 1 X Wireless Serial Port Module Only The Above Package Content, Other Products Are Not Included. Note: Light Shooting And Different Displays May Cause The Color Of The Item In The Picture A Little Different