TOA Wireless Microphone WM-1210 Utilizes 800MHz band B-type PLL synthesizer method. 30 frequencies can be set. Uses AA batteries for power. Scratches and stains present, but Sound output confirmed. How about as a spare? The numbers on the frequency dial are faded, but Setting was possible. Instruction manual downloaded from the internet is included. The manual may be folded to fit in the box. No returns accepted. Thank you for viewing.