This duplex hotspot board supports 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 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