KONNWEI Mini BT Wireless OBD-II Car Auto Diagnostic Scan Tools Black KW902

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