New Direction Tackle WI-FI Sonar Range Extender 2 (small box version) for mobile fish finder. It comes with a waterproof box. Just a few tap away to link your WIFI sonar to ND Extender. Easily expand wireless coverage of SONAR(>200 Meters). If you use it with 20000 power bank, It can use more than 70 hrs.It can hold every size tablet. Carefully crafted by Kepa Design.