1. with power self-test function, you can quickly check whether the map transmission is working normally. 2. frequency locking function, boot does not interfere with the companion; 3. 30.5x30.5mm and 20x20mm mounting holes to improve the compatibility of the rack. 4. 25mW-2.5W adjustable power, allowing you to seamlessly switch between different environments.<br><br>Product Name: VT5804-BAT Output power: 0-25-400-800-1500-2500mw Input Voltage: 6-36V Adjustment mode: Push button/OSD Operating Current: Less than 450ma 12V,850mw;Less than 620ma 12V,2500mw Output Frequency: 56CH(A-B-E-F-R-X-L) Antenna Interface: MMCX Mounting holes: 30.5x30.5mm or 20x20mm Video Format: NTSC/PAL Auto Detection Colour:Black Material:Aluminum alloy + PC<br><br>Package Contents: 1 x Image Transmission(Due to different product batches, the appearance may vary, which does not affect the use)<br><br>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.