The CW-300 is YAMAX's institutional grade pedometer and its answer to the broken clip concern that some have with the SW-series DIGI-WALKER pedometers; it has a metal clip. And although it uses a coiled spring, its internal sensor mechanism is different than the SW-series internal sensor mechanism. The CW-300's internal sensor mechanism employs a reed switch. Like other DIGI-WALKER™ pedometers, the CW-300 model counts steps, has a clock and gives a rough estimation of time in motion which is not to be confused with the NL-1000 accelerometer's MVPA timer. The CW-300 is a pedometer; the NL-1000 is an accelerometer. Accelerometers contain mechanisms that can actually measure acceleration and then use sophisticated algorithms to calculate the number of minutes spent in moderate-to-vigorous physical activity. Suspended lever arm pedometers (the ones that go click-click) like the CW-300 cannot measure acceleration, and therefore group all movement time--light, moderate and vigorous--together. The biggest reason that one would choose the CW-300 is its institutional grade and metal clip. The CW-300 is about 2 1/4" x 1 3/4" x 7/8" and weighs about an ounce. It has a dual display. It uses a 3 volt battery (CR2032). The battery is available through NEW-LIFESTYLES. First Class Mail shipping and handling for 1-3 units is only $6.95. Learn more about shipping and handling fees. Buying a gift? Consider our gift packaging options. DIGI-WALKER™ CW-300 Institutional Grade Pedometer (Suggested Retail $29.95) CW-300BB$29.95, 2/$49.90, 15/$299.25, 30/$583.50, 50/$748.75, 100/$1,497.50 Copyright 2003-2006 NEW-LIFESTYLES INC.