Note: We do not come with a SIM card. If you are a 4G card, a 4G card requires a local SIM card that can use a 2G network！！！ Features 1. Small size and light weight, easy for carry. 2. Black shell, easy to hide, perfect for tracking vehicles, teens, spouses, elderly persons or assets. With two powerful magnets inside, easy to attach to vehicle sure, no extra installation need. 3. All you need is a working SIM card (NOT included!) to insert into the device, then you can track and map (with Google Maps) in real-time over the Internet. 4. Dial SIM card number, then you can hear voice around this tracker, with no light and no noise, you can monitoring and spy what's going on around tracker silently and secretly. Function Instructions Record: Send number 555 to alarm phone, begin to record. Sound monitoring: Send number 666 to alarm phone. GPS track: Send number 777 to alarm phone, the phone receive geographic position and map link. Positioning trajectory: Send number 102 to alarm phone. Delete Memory Card Content: Send Number 445 to alarm phone. Reboot the phone: Send number 999 to alarm phone, start success after 1 minute. Reset the phone: Send number 444 to alarm phone. Specifications Warning: Must insert SIM card before charging Type: Magnetic GPS Locator Material: Plastic Size(approx): 1.57 x 0.91 x 0.63 in Quantity: 1pc Color: Black Talk Time: 150 -180 minutes Standby Time: 12 days Working Time: 4 - 6 days Expansion Card: Mini TF card Carrier's frequency band: GSM 850/900/1800/1900Mhz GMS Locating Time: 25 Seconds Power Input: AC 110-220V 50/60Hz Power Output: DC5V 300 - 500mA Battery Capacity: 3.7V 400mAh Li-ion Battery Working Voltage: 3.4 - 4.2V DC Storage Temp.: -40 to 85 celsius Operation Temp.: -20 to 55 celsius Humidity: 5%-95% non-condensing Package Included（1~5 PACK) 1 x Mini Magnetic GPS Tracker 1 x USB Charging Cable 1 x English User Manual