If installation site is with WIFI, we suggest you buy wifi version.If installation site is without WIFI, we suggest you buy 4G sim version.Security camera can be controlled on your phone. No matter where you are, even if another city, another country. You still can monitor that place on your phone.WIFI Wireless PTZ Solar Camera 4G SIM 3MP Outdoor Solar Panel Two Way Audio Security Protection Camera Battery CamWhat is the difference between 4G version and WiFi version?WIFI Version Camera(not support 4G Network and SIM Card)Support Wireless/Wired Connection.According to your needs, you can choose wireless connection or network cable connection.Please note that it only supports connecting to 2.4Ghz networks.4G Version Camera(not support wifi network)Support work with 3G/4G SIM Card.Do not support WIFI/RJ45LAN Cable Connection.4G version Camera is suitable for some places where WIFI cannot be installed and used, but the 4G network signal is covered.Solar camera details:APP: Ubox Image Sensor: 1/3" CMOS Sensor Lens: 3.6mm Resolution: 3MP(2048*1536)Solar Panel:3WIR-CUT filter: Switch automatically Night Vision: IR Light / Colorful Two-way Audio: Supported Connection way: 2.4Ghz WiFi or 4G Sim-card Wireless Standard: 2.4GHz, 802 .11b/g/n (5G is not supported) Storage: Cloud storage(extra charge) / SD Card(optional)Features:Cloud storage and TF card storage maximum 128Gwithout TF cardWIFI 24GHz IEEE 80211 bgn, remote viewing/playback via APP (UBOX)Automatic video recording and message push when human body motion wakes upArbitrary arming time can be setWaterproof grade IP66Solar Energy No Need to Charge*The solar panel can provide non-stop power for the outdoor camera. *Stable low power consumption. *Green solar energy, This wireless CCTV camera take advantage of renewable and abundant solar power. You