FULL COMPATIBILITY; Works with most pedometers, Smartphones (Under 6.7 inch) and Smart Watches HIGH QUALITY; Premium material with the skidproof foam pads on the bottom, the base is steadier than any phone rockers. 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 shaker and start earning steps to exchange the daily reward without walking outside. It serves apps such as Pokemon GO (Adventure Sync), 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