Standard 25 x 25 x 4MM high sensitivity GPS antenna TTL 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 Features: Chip:UBX-G7020-KT C/A code,1.023MHz Stream receive frequency:L1 [1575.42MHz] receive channel:56CH S11 SWR:1.3 S11 :50Ohm+(-)5% S21 Log :20.0dB S22 SWR: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 Condition: New color:Blue Material:PC+metal Package Contents: 1 x GPS Module(VK2828U8G5LF) 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.