Features: This wireless fish Finders comes with clear LED displa. It's easy to read the screen in sunlight or night. Water bottom shape and structure is showed in middle as well as water depth, fish size, and location. Can set fish alarm, depth alarm, contrast, chart speed(10 grades), fish display, unit(depth: meter/feet; temperature. You can mount the Sensors on boats or fishing rod with string or float it to accessible area. This is a great partner to go Ice Fishing, Lake Kayaks Boats Fishing. Specifications: Materials: ABS and aluminum alloys Color: Black Redness/Green/All Black Size: about 12.5x6.3x2cm/4.92x2.48x0.79inch Battery: 3.7V 1000mAh Screen: 2.4inch Use time: 5 hours Depth detection: 0.6-40m/1.97-131.23ft Sonar frequency: 125KHz Detection distance: 100m/328ft Working temperature: -10-70° Radiation angles: 45° Package Includes: 1pc Portable Wireless Fish Finders note: Please allow 1-2cm errors due to manual measurement, make surely that you not mind before order. Due to difference between different monitors, the picture may not reflect the actual color.