Specification: Power supply range: 10 - 15 VDC Max current : 450mA Max working power: 100 watts Max measured power: 150 watts Minimum power for tuning start: 1 watt Recommended maximum power while tuning not above 30 watts. (after tuning you can set 100 watts and work on this power) Minimum measured power: 0.1 watt Step for measurement on powers under 10 watts: 0.1 watt Step for measurement on powers above 10 watts : 1 watt Power measurement accuracy : 10% Maximum inductance set: 8.5 uH Minimal step for setting inductance: 0.1 uH Maximum installed capacity: 1870 pF Minimal step for setting capacity: 10 pF 100 Watts tuner, 7x7 (7 capacitors x 7 coils) based on 16F1938. Dimentsion:120 mm x 62 mm. Package Included: 1X PCB for ATU-100 7x7 HF autotuner 6X T68-2 1X BN43-202 1X PIC16F1938 (1pcs) soldered on PCB with default firmware v3.0 100R 2512 1% (4pcs). 15X relay HK4100F-DC12V Related Products:oscilloscope,handheld oscilloscope,frequency generator,antenna analyzer,spectrum analyzer,hf antenna,signal generator,logic analyzer 1.DIY kit, need to have welding ability; 2. Need to burn-firmware, 3.SMD electronic components have been soldered, 4.KIT of ATU (Automatic Antenna Tuner) developed by N7DDC 5.All information about project you can find on GitHub (N7DDC).