The Administration for Industry and Commerce of the city announced the test results of 20 batches of MP4 players: 15 were unqualified with a failure rate as high as 75%. The main problems of unqualified MP4 players were insufficient capacity and excessive radiation leakage. It was found that the actual usable capacity of 3 batches of MP4 players was smaller than the indicated value. For example, the "Benss" brand MP4 player (model V63) produced by Shenzhen Blue Morning Technology Co., Ltd. and sold at Yibaidu Supermarket Co., Ltd., Quyang Store in Shanghai, had a nominal capacity of 1G, but the actual detected capacity was only 0.94G.