TANITA [Japan domestic manufacturers first BLE possible cooperation with the iPhone & popular iPhone app installed] and [weight 50g unit display] body composition meter inner scan dual black RD-901-BK Size: W328  D298  H31mm / body weight: about 2.1g (including battery) Material Material: tempered glass, ABS (acrylonitrile-butadiene-styrene) resin, PE (polyethylene) Country of origin: China Power: DC6V AA batteries  four Accessories: body, try for battery (alkaline AA batteries) 4 ,  Japanese Quick Setup Guide