Features: High performance 32-bit ARM processor.Fully tested Supports , P-25, D-Star and System Onboard to show status (Tx, Rx, PTT, Mode) Up to 10mW RF power SMA antenna connector, Antenna included.Uhf 430-450 MHz, 433mhz and 900MHz Mounts cleanly on all current for 's including for the Pi Zero The firmware is pre-loaded and is easily upgraded via software. Open source 3D printable case available VHF 144 220 Opera FREQ Note: Without shell Not include the The firmware is pre-loaded.Please do not upgrade the firmware by yourself. The upper part is TX, the lower is RX antenna. UHF+VHF SMA, antenna Modem select: STM32_HS_GPIO Set TX frequency, RX frequency TX, RX frequency had better 10M or more apart. SLOT1, SLOT2 support. Note: Two , only not include the OLED RX OFFSET = TX OFFSET = 0 : ELECTRICAL Material: plastic colour: As Shown Package Contents: 1 x board 2 x Antanna 1 x OLED display Only 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.