The RD-953 incorporates the medical grade Dual Frequency BIA technology, which uses two different bio-electrical impedance frequencies, giving more accurate body composition results as well as one's muscle condition - "Muscle Quality Score", which is assessed in 3 categories: High. Standard and Low. With reference to this score, users can improve the Muscle Strength by doing more exercise in a regular basis. Results are shown on the monitor’s LCD display and can be instantly be transmitted to your iPhone & Android system using Bluetooth technology and uploaded to your iPhone, where you can monitor and evaluate your progress using the free Tanita Health Planet App. The RD-953 has a four-user memory, each with its own colour display and an auto-recognition feature, so you can simply step on to the scale without inputting your details each time. It also provides colour-coded assessments of your measurements, with green for healthy readings, yellow for borderline and red alerting you that attention is needed. Wight / Body Fat % / Total Body Water / Muscle Mass / Muscle Quality / BMR / Metabolic Age / Visceral Fat Rating / Physique Rating / Bone Mass / BMI / Auto Recognition.