Turn on the switch: the wall chart is in the learning state. Press the learning key: press the O key in the area to pronounce the corresponding pinyin pronunciation. Press the continuous key in this state, and Pinyin B, P ... will be read continuously in order. Press the second key of learning: press the O key of the area to pronounce the corresponding pinyin spelling. Press the continuous key in this state, and the pinyin spelling BB-O-BO will be read out in order. Press repeat key: press this key to repeat the previous pronunciation in the state of learning one, learning two, quiz and music. Press the test key: enter the test state. 1. Test method: randomly give 10 questions each time, press the key to answer, each question has three chances to answer, and the score will be given after the test. 2. Scoring criteria: the full score of each question is 100, the first correct answer is 10, the second correct answer is 8, the third correct answer is 6, and all three answers are not 0. Press the music key: enter the state of music appreciation, and switch a piece of music every time you press the key, in turn: Duo? Mimi, jasmine, alphabet song, lullaby, jingle bells, matador, ode to joy, edelweiss, happy clapping song, four cygnets. Press the key of the electronic organ: Enter the electronic organ state, at this time, press the white key or black keys of the piano to make corresponding music sound. Press the volume key: adjust the volume. Please use three number five alkaline batteries. When the sound of the wall chart becomes smaller or disappears, please replace the battery in time. Please take out the battery when it is not used for a long time.