1. positioning function: GPS satellite + BeiDou satellite + Wifi + AGPS + base station -- dual-star positioning, more accurate positioning. 2. Two-way call: three buttons can dial three different numbers. 3. Receiving mode: In APP--Contacts, you can set different call modes. 4. History View: save the device running track within 90 days. 5. alarm function: virtual electronic fence, set the range of the area, more than this range can be alarmed. Subject to a certain intensity of vibration alarm, low battery alarm. Electricity-saving function: ultra-long standby, simple operation. wifi function: new wifi locator, to solve the indoor, underground shopping malls, etc., no satellite signal can not be located. Mobile 4G full network pass CAT1:LTE-FDD:B1/B3/B5/B8, LTE-TDD:B34/B38/B39/B40/B41 Colour:Blue Material:ABS+PC Size:8.55x5.4x0.8cm Package Contents: 1 * GPS locator 1 * charging cable 1 * lanyard 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.