1. Fully Assembled Device: Mmdvm Hotspot Is A Fully Assembled Device That Supports , , P25, D-Star And System . With , It Supports Duplex Mode And Simplex Mode.2. Radio Frequency: In Duplex Mode, Support Uhf 430-440mhz; In Simple Mode, Support Uhf 430-440mhz And Vhf 140-150mhz. Tx=0,Rx=0 Is The Best Adjustment, No Offset Is Required.3. Easy Installation: The Software Pi-Star Is Pre-Installed On The Tf Card, No Need To Download It Again. Note: When You Flash The Tf Card With A New Version Of Software, Please Do Not Copy Directly To The Tf Card. Use A Writing Tool To Write The Software On The Tf Card.4. Usb Cable Expansion Interface: If You Want To Use A Usb Cable To Connect The Duplex Mmdvm To The Computer, You Must Use The Usb Cable For The Expansion Interface Included In The Package. The Universal Android Cable Connector Is Relatively Short And The Connection Doesn'T Work.5. Duplex Hotspot Board, Multi-Mode Digital Voice ModemType: for 4th GenerationSize: About 1.3x2.2x2.2cmColour:blackMaterial:MetalPackage Contents:1 x MMDVM Hotspot Board1 x 8gb Memory Card2 x Antenna1 x Usb Cable1 x English Instruction ManualNote:Different Batches May Have Differences In Product Appearance, Color, And Printed Characters, Which Will Not Affect The UseOnly the above package content, other products are not included.Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.