not reliable long term not suitable for international travel [SEP] i have been through many of these do not expect them to last more than a year unfortunately for the environment it costs less to buy one of these every year than one more reliable modelmy second issue is that the base only works on i cannot take this brush with me when i travel since i cannot recharge it adding a transformer in the bathroom is not practical i am sure some more expensive models work on worldwide voltage but due to overall unreliability of all those toothbrushes i refuse to buy one if one carried a warranty of at least years i would