Zoll Medical Corp.(ZOLL) released an iPhone app aimed at training people to provide CPR.

The Chelmsford, Mass.-based resuscitation device maker said its $5.99 PocketCPR program uses the Real CPR Help technology found in Zoll’s defibrillators. The app provides real-time feedback on the rate and depth of compressions during CPR, giving visual and audio step-by-step instructions and feedback.

Zoll recently reported a mixed bag during the fourth quarter and much of 2009, as slumping spending on big-ticket equipment hit its top- and bottom-line results.

The Chelmsford, Mass.-based resuscitation device maker posted sales of $385.2 million during fiscal 2009, down 3.2 percent compared with $398 million during the prior year. Annual net income slumped 59.2 percent to $9.6 million, compared with $23.4 million during fiscal 2008.

During the three months ended Sept. 27, Zoll reported sales of $107.9 million, up 2.2 percent compared with $105.6 million during the fourth quarter last year. Net income plunged to $3.4 million, however, compared with $8.9 million during Q4 2008, a 61.7 percent slide.