1、Forward and reflected power direct digital readout, without any calibration. 2、Only works on gasoline cars, NO diesel vechicles! 3、Maximum measurable power range up to 100W.3seconds check your antenna SWR , also check your radio RF power watt. 4、Stable Wireless connection. The adapter uses the fastest and most reliable arm chips Supports ObdII protocols: iso15765-4 (can), iso14230-4 (Kwp2000), iso9141-2, J1850 vpw, J1850 pwm. 5、Compatible with Android phones only - not for use with iOS devices! Wireless (BT) . Features： Forward and reflected power direct digital readout, without any calibration. Only works on gasoline cars, NO diesel vechicles! Maximum measurable power range up to 100W.3seconds check your antenna SWR , also check your radio RF power watt. Stable Wireless connection. The adapter uses the fastest and most reliable arm chips Supports OBDII protocols: iso15765-4 (can), iso14230-4 (Kwp2000), iso9141-2, J1850 vpw, J1850 pwm. Compatible with Android phones only - not for use with iOS devices! Wireless (BT) . Frequency Range: COVER: 100MHz~520MHz Insertion Loss: < 0.15dB (VHF), < 0.25dB (UHF) Temperature: 0℃~70℃ Battery Build -in: Li-ion Battery Size (WHIT OUT SMA: 25*25*60 (mm) Power in: 5V (micro usb) Interface (in and out ): SMA female Impedance: 50Ω Specifications: Brand: KONNWEI Color: Orange Measurable power range: 0.5-100W Maximum power: 100W Accuracy: mean + / - 5% MAX. Power in: 100 WATT V.S.W.R: 1.00~19.9 Package Weight: 50g / 1.8oz Package size: 12 * 5 * 1cm / 4.7 * 2 * 0.4in Package List: 1 * OBDII Scanner BT KW902, 1 * English User Manual 1 * Drive 1 * OBDII Scanner BT KW902, 1 * English User Manual 1 * Drive