Hamilton Multi-Channel Headphones.

The Hamilton Multi-Channel Wireless Listening Center is perfect for all multimedia, lab and classroom applications. The entire system can be switched between 4 different frequencies with easy color-coded switches. Add additional transmitters to have up to 4 different channels of audio simultaneously! Go Wireless in your classroom with plug and play simplicity.

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.