MFJ-447 Deluxe Electronic Keyer - Like new, excellent condition - $65 (includes charger and shipping). Payment by PayPal only. The MFJ-447 is a deluxe electronic keyer. It supports Type A and Type B iambic keying. It has a nonvolatile memory. The code speed (2 to 65 WPM), weight and sidetone frequency may be adjusted. Speaker output on rear panel. . Retail - $79.95. Operates from a 9 Volt battery (not supplied) or MFJ-1312B AC adapter. The MFJ-1312D (included) is a 13.8 Vcd 500 mA AC Adapter with a 2.1mm jack.It is used to supply 110V power to a large range of MFJ devices. Retail - $15.95.