With 1602 LCD screen and ultra-small size, it is easy to carry. ATU: (Automatic Antenna Tuner Unit): Automatic Antenna Tuner Unit is a miniaturized clone of David Fainitski, N7DDC's infamous 7X7 ATU100 automatic antenna tuner unit adapted for QRP operation up to 10 watts. USDX: - 8 bands: 3.5MHz; 5.3MHz; 7MHz; 10MHz; 14MHz; 18MHz; 21MHz; 29MHz - Emission efficiency: higher than 85% (3.5MHz; 5.3MHz; 7MHz; 10MHz; 14MHz); higher than 80% (18MHz and 21MHz); higher than 70% for 29MHz - Connect to PC, use FT8, JS8, FT4 and other digital mode software control, support CW automatic decoding - It can reach 3-5W power in 8 bands and can freely upgrade the PA module (TO-220) - High-precision TCXO for KDS, frequency accuracy better than 1PPM, frequency stability better than 0.5PPM - Independent core board, RF PA board and ATU board to avoid own signal interference - Ultra-small size: 100 x 90 x 57mm/3.9 x 3.5 x 2.2 (without protrusions) - All LPF parts use 100V C0G/NP0 capacitors - Use original LM4562 or LM833 or LT6231 op amp chip - Rich interfaces: HEADPHONE, PTT OUT, MIC/PTT, SPK/MIC - BNC antenna interface (with BCN-SL16 adapter, easy to match antenna) - External power supply: 12.6VDC (13.8VDC power adapter) 2. Headphone Jack (3.5 mm): Tip-Audio out Ring-Audio out Sleep-GND 2.MIC/PTT (KEY) Jack (3.5 mm): Tip-Mic input Ring-PTT Sleep-GND CW-KEY INPUT MODE: Tip-DAH Ring-DIT Sleep-GND 3. SPK/MIC Jack (3.5 mm): TIP: SPEAKER RING 1: MIC RING 2: PTT SLEEVE: GND 4. PTT OUT Jack (3.5 mm): Tip-SSR output Ring-SSR output Sleep-GND Package Included: - 1 x Main Unit uSDX_ATU - 1 x 12.6VDC Power Adapter (or 13.8VDC) - 1 x BNC-SL16 Adapter - 1 x BNC-BNC Cable - 1 x UV-3R Handheld Microphone (including MIC, PTT, SPEAKER functions) Note: - Note that there is no built-in battery or built-in speaker. External power supply 13.6v is required. Usually it cost about 35USD-50USD. If you receive defective item, please kindly notify us within 14 days. This item is in the category "Consumer Electronics\Radio Communication\Ham, Amateur Radio\Ham Radio Transceivers". The seller is "buyfromtzt" and is located in this country: CN. This item can be shipped worldwide.