Hamilton W901 Multi-channeled headphones. Get 40 hours of listening time between charges with only an 8 hour charge time. Superb sound quality without wires or interference. Powered by classroom friendly internal NiMH battery. NO TOXIC CHEMICALS - MERCURY FREE
Switchable between 4 frequencies:
• Blue - 72.500 MHz
• Yellow - 72.100 MHz
• Green - 72.900 MHz
• Orange - 74.700 MHz
Product Features:
• Superb sound without cords or wires - no interference from other electronic equipment
• Operates on dedicated channels
• No external antenna on the headphone
• LED charging indicator light lets you know when headphones are fully charged
• 40 hours of operating time between charges, 8 hour charging time
• One (1) year warranty.