Sound Amplifier With Headphones BUKI experimental box – sound amplifier The set includes headphones and a sound amplifier to listen to the sounds of the animals and the environment in nature. Suitable for children over 6 years old. Contents: 1 sound amplifier with microphone, on/off switch, frequency controller, headphone jack, viewfinder and a battery compartment, delivery without a 9 V block battery, 1 parabolic antenna, 1 headphone, including instructions, 3-part