One of the surest signs all is safe below to mallards above is the presence of brethren relaxed enough to feed. Higdon's Pulsator has a built-in nozzle backed by a timer that bubbles up the action every 1.5 seconds.
No cords run back to the blind, because the decoy comes with its own waterproof battery compartment, which also serves as the decoys weight. Turn it on, drop it in and leave it. When the hunt is over, plug it into using the included recharging cord.
Contact: Higdon Decoys; (270) 443-8739; www.higdondecoys.com