Features 1、It is suitable for people who have severe hearing impairment, especially elderly people. 2、The device's 7 adjustable volume levels allow you to fine tune the amplification, "1" for the minimum volume and "7" for the maximum. 3、"N" indicates normal work mode. "H" can help you reduce low frequency noise to get a clearer sound. "PC" means peak clipping adjustment. 4、3 different sizes of earplugs (large, medium, and small) are provided, which can offer a comfortable and secure fit for different people's ears. 5、The clamp of this product helps you fix the device in your pocket. Powered by AA batteries (not included) for convenient and reliable operation. Specification Description: This product is a sound device. Using it can help you rediscover the pleasure of listening to nature's sounds or talking to others. Different from the device that is ear hook shape, this product can be fixed in your pocket, which is more convenient to control the voice volume. Specifications: Maximal Sound Output: 130dB ± 5dB Maximal Sound Gain: ＞50dB Harmonic Wave Distortion: ≤ 5% Frequency Range: 300-4000 Hz Input Noise: ≤ 30dB Battery: 1 * 1.5V AA Battery (Not included) Working Voltage: DC 1.5V Working Current: ≤ 4mA Material: ABS Color: White and Wine red Item Size: Approx. 11.8*11.0*4.2cm/4.64*4.33*1.65in Item Weight: Approx. 35g/1.23oz Total Size: Approx. 17.5*11.0*9.5cm/6.89*4.33*3.74in Total Weight: Approx. 115g/4.05oz Package List 1 * Sound Amplifier 1 * Connecting Cable 1 * Earplug Connector 3 * Earplug 1 * User Manual