[FULL COMPATIBILITY]: Support 2 phones and work with most pedometers, Smartphones (Under 7.2 inch) and Smart Watches [HIGH QUALITY]: Premium material with the skidproof foam pads on the bottom makes base steady and firm. The noise is reduced to the least possible with special design on both arms [DUEL POWER & SAFE]: Smartphones can be shaken automatically safely while you are doing something else. It can be utilized with USB port or 4 AA batteries Earning about 7500 steps per hour [APPLICATION]: Tie the phone to the phone walker and start earning steps to exchange the daily reward without walking outside. It serves Apps such as compatible for PokemonGo (Adventure Sync), Pikmin Bloom, Walkr, GoogleFit [SATISFACTION GUARANTEE]: If the phone doesn't count the steps, place the phone upside down on the shaker or contact us to find out a best solution since each smartphone has different pedometer sensors 1