This duplex hotspot board supports UHF, VHF, and supports 400M, 100M, and 800M. With premium temperature complementary crystals, stable operation performance and no bias frequency. Supporting B+, 2B, 3B, 3B+, 4B, etc. Support OLED screens and serial Nextion screens. Compatible with Raspberry Pi and ready for use.​ Features: This duplex hotspot board supports UHF, VHF, and supports 400M, 100M, and 800M. With premium temperature complementary crystals, stable operation performance and no bias frequency. Wide ranges of applications, supporting B+, 2B, 3B, 3B+, 4B, etc. Circuit tantalum capacitor filtering, stable operation, can be 7 * 24 hours opened. The using effect of DMR is very nice, (C4FM, P25 have been tested). Support OLED screens and serial Nextion screens. Compatible with Raspberry Pi and ready for use.​ Specifications: Name: Duplex Hotspot Board Material: printed circuit board Display size: 28 * 27 * 18mm / 1.10 * 1.06 * 0.71in Item size: 66 * 56 * 6mm / 2.60 * 2.20 * 0.24in Item weight: 20g / 0.71ounce Package size: 120 * 80 * 20mm / 4.72 * 3.15 * 0.79in Package weight: 25g / 0.88ounce Packing List: 1 * Duplex Hotspot Board 1 * Display 2 * SMA