Personal Listeners Use for TV, Radio, Hi-Fi & Conversation Portable, Light & Comfortable 3 Style Options. Ideal to use for listening to TV, Radio, HiFi or for conversation. Amplifies sound without changing volume for other family members. Includes: Crescendo 50 amplifier with tone control and indicator light, with either a stethoset head set, headphones (not shown) or neck loop, 4m microphone with tie clip, belt clip, neck cord. Neck loop version is suitable for hearing aid users & requires switching to 'T' setting. Requires 2 x AA batteries (included).