The SmartCast RF 30 Wrist Mount from Humminbird puts portable fishfinder technology right on the angler's wrist. The Remote Sonar Sensor gives the user 400 hours of castable sonar detection, thanks to Wet Switch technology that preserves the battery when the sensor is out of the water. The 48-by-32-pixel display gives a clearly defined picture and runs on a replaceable battery. The wrist-mounted unit is waterproof and uses simple, one-touch menu navigation to provide features such as fish identification, depth range and a fish alarm. The SmartCast RF 30 Wrist Mount Fishfinder sells for $89.95. Techsonic Industries, Eufala, AL; (334) 687-6613; www.humminbird.com.