Thank you for contacting Polar Customer Care. The FT4 is no longer available through us directly. Some of our retailers may have this in stock. You may check with amazon.com or heartratemonitorsusa.com.
If you need further assistance please feel free to contact us using the link below. Representatives are available via Livechat, E-mail and our toll free line Monday-Friday 8:45am-5:15pm EST.
http://www.polarusa.com/us-en/support/contact_us/email_polar
Thank you for choosing Polar!
Polar Customer Care/Pat
Polar Electro Inc.