Standard 25*25*4MM high sensitivity GPS antenna UART/TTL,232 optional interface adopt KDS 0.5 PPM High Precision TCXO Built-in SQI Flash Built-in crystal and Picofarads capacitance.faster hot root Built-in LNA,Low-noise amplifier 1-10Hz Support AssistNow Online and AssistNow Offline GPS,GLONASS,,SBAS(WAAS,EGNOS,MSAS,GAGAN) Hybrid Engine Chip:UBX-G7020-KT C/A code,1.023MHz Stream receive frequency:L1 (1575.42MHz) receive channel:56CH S11 SWR:less than equal 1.3 S11 :50Ohm+(-)5% S21 Log : equal 20.0dB S22 SWR:less than equal 1.3 Location Performance: Less than 2.5m(Autonomous)(50%) Less than 2m(SBAS) rate:Less than 0.1m/s direction:Less than 0.5 Degrees Timing accuracy:30ns Reference coordinate system:-84 Maximum altitude:50,000 m Acceleration:Less than 4g Tracking sensitivity:-162dBm catch sensitivity:-160dBm root time:29s (in average) warm root time:28s(in average) hot root time:1s(in average) AGPS:3s colour:Main color green Material:ABS+ metal Package Contents: 4 * GPS Model 4 * Cable. Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.