Philips Sonicare 5 Series HX8931/10, Adult, Sonic toothbrush, Daily care, Gum care, Blue, 62000 movements per minute, 2 min, 30 sec Philips Sonicare 5 Series HX8931/10. Purpose: Adult, Toothbrush type: Sonic toothbrush, Teeth brushing modes: Daily care, Gum care. Battery type: Built-in, AC input voltage: 110-220 V, AC input frequency: 110-220 V. Number of handles included: 1 pc(s), Number of brush heads included: 1 pc(s). Battery technology: Lithium-Ion (Li-Ion)