It is important to use age-appropriate listening materials for hearing-impaired children who have cochlear implant device or hearing aid device to faciliate their language development. The learning by listening module in the Angel SoundTM is developed to incoporate scheme-based trainng protocols for children with cochlear implant device or hearing aid device to discriminate different sounds as well as learn new words. Group 1: Learning ABC The Learning ABC Group is to help the children to discriminate and identify all 26 English letters (A- Z) spoken by different speakers under different listening environments, including quiet, phone conversation, music background. The tasks in this group are aimed at improving the listeners’ ability to discriminate the acoustic difference across among these letters, which is the foundation for learning new words. This test group has four different listening environemtns, including 1. Quiet: The letters are presented in quiet listening conditions. 2. Phone: The letters are presented via traditional phone line with limited bandwdith (300-3200Hz). 3. 10-dB: The letters are presented in the presence of music background with 10 dB SNR. 4. 0-dB: The letters are presented in the presence of music background with 0 dB SNR. Group 2: Learning Food Name The Learning Food Name Group is to help the children to discriminate and identify about 100 different food name spoken by different speakers under different listening environments, including quiet, phone conversation, music background. The tasks in this group are aimed at improving the listeners’ ability to discriminate the acoustic difference across among these food names, which is important in their daily. This test group has four different listening environemtns, including 1. Quiet: The food names are presented in quiet listening conditions. 2. Phone: The names are presented via traditional phone line with limited bandwdith (300-3200Hz). 3. 10-dB: The food names are presented in the presence of music background with 10 dB SNR. 4. 0-dB: The food names are presented in the presence of music background with 0 dB SNR. Group 3: Learning Animal Name The Learning Animal Name Group is to help the children to discriminate and identify about 100 different animal name spoken by different speakers under different listening environments, including quiet, phone conversation, music background. The tasks in this group are aimed at improving the listeners’ ability to discriminate the acoustic difference across among these animal names. This test group has four different listening environemtns, including 1. Quiet: The animal names are presented in quiet listening conditions. 2. Phone: The names are presented via traditional phone line with limited bandwdith (300-3200Hz). 3. 10-dB: The animal names are presented in the presence of music background with 10 dB SNR. 4. 0-dB: The animal names are presented in the presence of music background with 0 dB SNR. Group 4: Learning Colors The Learning Color Group is to help the children to discriminate and identify 12 common colors spoken by different speakers under different listening environments, including quiet, phone conversation, music background. The tasks in this group are aimed at improving the listeners’ ability to discriminate the acoustic difference across among these color names. This test group has four different listening environemtns, including 1. Quiet: The color names are presented in quiet listening conditions. 2. Phone: The names are presented via traditional phone line with limited bandwdith (300-3200Hz). 3. 10-dB: The color names are presented in the presence of music background with 10 dB SNR. 4. 0-dB: The color names are presented in the presence of music background with 0 dB SNR. Group 5: Learning Numbers The Learning Number Group is to help the children to discriminate and identify 20 common numbers (1-20) spoken by different speakers under different listening environments, including quiet, phone conversation, music background. The tasks in this group are aimed at improving the listeners’ ability to discriminate the acoustic difference across among these numbers. This test group has four different listening environemtns, including 1. Quiet: The numbers are presented in quiet listening conditions. 2. Phone: The numbers are presented via phone line with limited bandwdith (300-3200Hz). 3. 10-dB: The numbers are presented in the presence of music background with 10 dB SNR. 4. 0-dB: The numbers are presented in the presence of music background with 0 dB SNR. Group 6: Phonetic Contrast The Phonetic Contrast Training Group is to help the children to discriminate and identify words with minimal phonetic contrast spoken by different speakers under different listening environments, including quiet, phone conversation, music background. The tasks in this group are aimed at improving the listeners’ ability to discriminate the acoustic difference across among different words with minimal phonetic contrast. This test group has four different listening environemtns, including 1. Quiet: The words are presented in quiet listening conditions. 2. Phone: The words are presented via phone line with limited bandwdith (300-3200Hz). 3. 10-dB: The words are presented in the presence of music background with 10 dB SNR. 4. 0-dB: The words are presented in the presence of music background with 0 dB SNR.