Feature:1. If it is used outdoors, we recommend that you install it in an open place, if it is used indoors, we recommend that you place it near a window.2. If there is no signal change when using this antenna for the first time, please turn off the power of the device, then connect the antenna, and then turn the power on again.3. Applications include: low data rate communication networks, long distance LoRa nodes, IoT and M2M nodes, Industrial and environmental monitoring, smart metering applications, LoRaWAN, Multipoint and NLOS applications, RAK V1 V2 Nebra Bobcat EasyLinkIn SenseCAP M1 and SyncroB. It's Helium Hotspot, HNT, mining miner, etc.4. The main body of the antenna is made of pure copper material, which has more excellent gain performanceSpecifications:Gain: 4dBiFrequency range: 868M - 2700M(2G/3G/4G)VSWR: lt; 1.8 Polarization: Linear Vertical Impedance: 50 ohm Direction: Omnidirectional Function: Magnetic Stand Antenna Connector: RP-SMA Male Connector Cable Length: 3 Meters/10 Feet RG58 Cable Waterproof: IP67Operating Temperature: -20°С - +80° С Storage Temperature: -30° С - +85° С List Package: 1 x Antenna 1X Adapter (As the picture shown)Note: Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you!Manual measurement, please allow 1-10mm error. Thank you for your understanding.