4 years & up. Amp up your Easi-Speak™ so the whole class can listen! Simply insert the microphone (sold separately) to project sound recordings that reach throughout the classroom. Also great for small groups, listening centers and media labs -- features 6 headphone jacks and volume control. Durable, portable unit runs on built-in rechargeable battery that lasts up to 3 hours when fully charged. Measures 12"L x 8"H.