The 433MHz spring antenna has undergone rigorous testing, boasting high gain, low VSWR, excellent performance, reasonable structure, easy installation, and stable performance. Application: The built‑in spring antenna is suitable for various 433MHz/510MHZ wireless modules and intelligent remote control equipment. Stable Signal: The standing wave ratio of 3DBi built‑in antenna is lower than 1.5, and the signal is stable, bringing you more convenience. Excellent Performance: RG1.13 wire high density braided shielding layer, oxygen‑free core, high conductivity and low loss. Professional Production: Have undergone extensive quality and safety testing to ensure long service life and strong durability. Frequency: 433-510mhz Gain: 3dBi Standing wave ratio / S.W.R.≤1.5 Impedance: 50Ω Max Input power: 10W Color: Black Material: Plastic+Metal Specification: 1 piece Package Contents: 1 X Antenna 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.