Fitbit Aria Wi-Fi Smart Scale Accessory,Budesi Body Weight Fat Scale Mat /Coaster/Pad for Fitbit Aria Black,White 1.PROTECT YOUR FEET: it can be a Insulation Mat in winter,the cold-proof function will let you not feeling cold when you stand on the fitbit aria by barefoot2.SKIDPROOF FUNCTION: it used high quality silicone material, very soft and comfortable,won't stick your feet even sweaty ,and can skidproof.more safety.3.ANTI DUST WATERPROOF FUNCTION: it's waterproof, easy washing and clean.also anti dust, will protect your fitbit aria clean all the time and make it as new while a long time used.4.NO EFFECT WEIGHTING :the silicone mat weight only 100g,very light and thin, no any effect the weighting data or other function during your lose weight or fitenss acitvity.5.ATTENTION: This body fat scale mat only suit for Fitbit Aria Scale,NOT suit for others.ONLY body weight mat,NO other Fibit Aria WiFi scale accessories. Feature:1.Only silicone mat, no other parts2.It's a smart scale accessory,Silicone Mat, size only suit for Fitbit Aira ,not for others 3.Packing included: ONE pack fitbit Aria scale mat !ATTENTION: about effect the body fat% or BMI data problem let us study how to calcuate the body fat% and BMI data first:1) Body fat%(full name:Body Fat Ratio)= (Body fat(kg) / Weight(kg)) *100%Data a=Waist(cm)*0.74, Data b=Weight(kg)*0.082+34.89, Body fat(kg)=Data a - Data bIF for Men change 34.89 as 44.742) BMI=Weight(kg)^2 / Height(m)Take a 60kg,83cm Waist,158cm Height Women for example:Data a = 83*0.74=61.42, Data b = 60*0.082+34.89 = 39.81, Body fat(kg)=61.42-39.81=21.61Body fat% = (21.61 / 60) * 100%=36.0167%BMI = 60 / 1.58^2 =24.0346AFTER added a Budesi Silicone mat: Weight = 60.001kg, Data b = 60.001*0.082+34.89 =39.810082, Body fat(kg)= 61.42-39.810082 = 21.609918Body fat% = (21.61 / 60.001) * 100%=36.0161%BMI = 60.001 / 1.58^2 =24.0350NOW from the two group data, we can know ,even added a silicone mat, the effect really is soooo slightly,maybe just like the different if a drink of water or not. really can be ignore completely.