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Introducing our latest innovation in hearing aid technology! Our new plug-in hearing aid features a rechargeable lithium battery for hassle-free usage and superior sound quality. With a maximum output of ±5dB 130 and a maximum gain of ±5dB 40, you can enjoy clear and amplified sound in various environments. The special function key (O-N-H) allows for easy adjustment of settings to suit your preferences. Plus, with a long-lasting battery life of up to 18 hours, you can rely on continuous usage throughout the day. Each package includes the hearing aid, rechargeable battery, three earplugs, and an instruction manual in English for your convenience. Say goodbye to missing out on conversations and enjoy improved hearing with our advanced plug-in hearing aid!