Listen Tech Portable Digital RF Receiver (72 MHz) LR-300-072 Superior audio quality - 80 dB signal-to-noise ratio (SNR), setting the industry's sound quality standard 17 channels 100 % Digital - Listen receivers are digitally-tuned so the transmission won't drift Limited Lifetime Warranty with hassle-free support Uses standard alkaline or nickel-metal hydride(NiMH) batteries