Brand Heacent Model HC688 Color Orange + black Quantity 1 GPS Chip U-BLOX Network GPS / GSM / GPRS Band 850 / 900 / 1800 / 1900MHz GSM/GPRS Module MTK GPS Sensitivity 159 dBm GPS Accuracy 10 meter Warm Start Time 35s Cold Start Time 45s Hot Start Time 2s Antenna Built-in Pre-loaded Map No Maps Included Google map Screen Size 1.44 inch Screen Format TFT Display Resolution 128 x 128 px PC Interface Supported USB GPS System Features GPS position / Two-way conversation / MP3 / SOS / Alarm clock / Monitoring / SMS position / Real-time tracking Operation Temperature 20'C~+70'C Storage Temperature 40'C~+85'C Humidity 20~80% Altitude Limit 18000m Velocity Limit 515m/s Memory N/A GB Memory Card Type TF Max Extended Capacity 4GB Power Supply AC 100~240V 2-flat-pin plug Battery Type 3.7V 1.7Wh Other Features GPS tracking and location; SOS emergency call; Speedily family number dial; SMS / Website platform location; Record and playback history contrail; Electric fence; Remote guardianship; Alarm clock; Band length: 23cm; Width: 2.7cm; Dial width: 5.3cm; Thickness: 1.6cm Packing List 1 x GPS watch 1 x Data cable (84cm) 1 x Earphone (120cm) 1 x 3.7V lithium battery 1 x Charger 1 x English manual