This fish finder can provide smart detection and stable support in different weather situation.Good partner for day and night fishing. Features: BT2.0 function supports the connection with smart phone APP.Replacement for iOS and for Android devices.Receiving Distance: 20meters. High resolution imaging display allow you kow the real-time datas,like fish location,water depth,temperature,battery power,etc.  Small,medium,or big sized fish icon displays on the screen when fish is detected. Adjustable sensitivity enables you to use the fish finder in different fishing environments. When the bottom sensor of device meets water,the night light will turn on automatically during the day/night.It is easy to find the device in dark enviroments. Blue&green flashing fish lamp makes it more attractive to fish and increase your bites of your fishing. 105° radiation angle and 125kHZ requency provide high efficiency. Detectable depth range is from 0.8m(2.6ft) to 48m(157.5ft). Built-in 1000mAh rechargeable battery,convenient to recharge with included usb charging cable. Wide application for ice fishing,river fishing,sea fishing,shore fishing,kayak fishing,etc. Convenient hole is designed for casting. Easily tie the fishing line to the device,you will not worry about missing easily. Specification: Color: Red / Black (optional) Battery: 1* built-in 3.7v 1000mAh polymer battery BT: 2.0 Frequency：125 KHZ Radiation Angle：105 degrees Detection Depth: 0.8 - 48 meter / 2.6 - 157.5 feet Work Temperature：-10℃ ~ 60℃ Size: 66.5 * 66.5 * 63.1 mm / 2.6 * 2.6 * 2.5 in Weight:approx. 90 g / 3.2 oz Package weight: approx. 200 g / 7.1 oz Package List: 1* Fish Finder 1* USB Charging Cable 1* User Manual