The wireless BuddyPhones Play+ have 3 SafeAudio levels to choose from to match the child's age or noisy environment. Patented StudyMode helps isolate voices from other sounds and produces crisper, clearer vocals for studying or watching lessons. Headphones can be used wirelessly or wired, meaning no interruptions when the battery dies. SafeAudio 75/85/94dB volume limit, voice enhancement StudyMode, 20 hours battery life, 20m wireless range. Works wired or wireless. Built-in microphone answer/playback button, BuddyLink for sharing Soft Protein, PU leather ear pads, adjustable headband size.