Ping is the world's smallest, lightest and most affordable ADS-B traffic receiver. Simply stick it on a window using the suction cap,
plug into power from a 12V lighter socket or portable USB battery bank, connect to its WiFi network and nearby traffic appears in OzRunways.
Dual Band Traffic via 978 MHz (USA) and 1090 MHz (worldwide)
BYO Power: low power consumption means battery banks last a long time