Fishfinder ALF**0 is based on ALF *0, but its screen is better and bigger. Receiver(screen) 1. Display size 4.5â FSTN. 2. Resolution **0 x **8 pixels. 3. 4 level Gray Scale. 4. Receiver screen sealed and waterproof . 5. Depth Capability: 0.6~*0m. 6. Sonar Frequency: **5KHZ. 7. Sonar Beam Angle: *0deg at **0db. 8. Monitor and Display Real-time Voltage of Bait boat Battery. Probe 1. Depth range: 1 to **0 ft (*0 meters). 2. Sonar coverage: *0 degree at **0dB (**5 kHz). 3. Water and Air temperature probe. Transmitter 1. Radio Frequency : **3.9 MH. 2. Wireless operating range **0 meters. 3. Power : 9.6 Volt external battery or 6 Volt boat**9;s battery. Software 1. Fish Identification Mode (big & small fish). 2. Alarm for fish detect and/or shallow water. 3. Monitoring battery life : When connected to the boat**9;s battery it will show you how much battery left. 4. Sensitivity setting from *0% to **0% by step of *0%. 5. Automatic or manual back light . 6. Adjustable display contrast . 7. Automatic Depth Range setting . 8. True changing bottom graph . 9. Depth Units: Meters/Feet . *0. Temperature Units: Celsius/Fahrenheit . *1. Preservable program setting . *2. Back up memory to save setting .