1. Has high sensitivity and starting threshold of wind speed, can effectively indicates the wind direction and help your sailing. 2. Luminous reflector on the bottom of the vane makes it easy to see both day and night. 3. Manufactured from premium marine grade stainless steel, lightweight yet durable, UVproof, will not become porous or brittle. 4. Equipped with birdproof spike which extends above vane to keep birds off mast, convenient to use. 5. Simple nondestructive installation, no other tools are needed, ideal for sailing and yachting wind direction indication. Colour:As Shown Material:Stainless steel Specification: Item Type: Wind Vane Application: Suitable for Marine Yacht Boat Sailing Wind Direction Indication. Note: Installation guide not included, we strongly recommend you seek professional installation. Please check as much as possible to make sure the item is what you need. Due to different batches, there may be differences in product appearance and printed text, which will not affect use Package Contents: 1 * Boat Wind Direction Indicator 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.