Convenient, Extremely accurate and robust. Different methods for different applications. Fully customizable. Charge either with 220v or 12V. This particular 12V unit with state of the art outdoor passive only R2499. This system is mobile and great for camping, fishing or even just to watch your gate motor at night from vandalism. Integratable with sms functionality or even cctv with remote view. Possibilities are endless 0726348428