TruTone is a highly adjustable hand-held electrolarynx that produces an excellent voice for people with vocal speech difficulties. The unit is made of impact resistant materials and operates on standard 9 volt batteries. Using its pressure sensitive button, you can add intonation to your voice to created a more natural speech. A wide volume range is possible using the volume control knob. The TruTone weighs less than 5 oz with the battery and is made of durable impact-resistant materials.