SUNPOLLO Clip on Fan and Desktop Fan 2 in 1, Battery Operated Fan for Baby Stroller, Home and Car USB or Battery Powered [4 AA Batteries Required, (not Included)] USB OR BATTERY POWERED -- The battery operated fan is Powered by universal USB outlet OR 4 AA batteries(NOT included). CLIP ON FAN AND DESK FAN IN ONE-- Easily attach the clip on fan to anything having a ledge, like a table, chair, pole or baby stroller. STRONG AIRFLOW-- 5.2 frame fan and 2200RPM rotating speed produces a strong airflow. MULTI-DIRECTIONAL ADJUSTMENT-- The battery powered fan can 360 degrees up and down head angle to get airflow from different directions. IDEAL FOR BABY STROLLER-- To offer the best stroller fan, we have made many tests to ensure the clamp was strong enough to clip and stay put, even on a moving baby stroller.