It is loud but large in size. Although the numeric keypad is easy to push even with gloves, the start button is small for some reason. I will not stop ringing until I press the stop button, even if I go home after going out, it is ringing. Just dropped from 2 to 30 cm may stop due to poor contact of the battery. One of the two batteries pushed the minus pole with a coil spring, but the other pushed with a plate-shaped electrode integrated with the other plus pole, when this was pushed by the battery at the time of falling and bent So that contact failure occurs. Although overall satisfactory, I want the battery case to be improved.