Shure QLXD1 H51, digital UHF pocket transmitter for guitar and bass, 24bit/48 KHz Audiosignal, AES-256 Advanced Encryption Standard encoding, up to 72 MHz bandwidth, 22 compatible channels per 8 MHz TV-Band, switchable transmitted power 1/10 mW, 120 dB dynamic range, metall housing with 4 pin TQG connector, works with SB 900 Lithium Ionen rechargeable battery Technology, optional also with 1,5V AA batteries, frequencyrange H51 (534-598 MHz)