Casio Quick Dialer Model QD-900 Since the battery is dead, I haven't been able to confirm its operation, so I'm selling it as junk. This is an auction for the main unit only. It's a calculator that can make phone calls. It generates frequencies corresponding to phone numbers from its speaker, allowing you to dial the number without pressing the phone buttons, such as on a tone-dial public phone. By holding the speaker on the back of the unit up to the mouthpiece of a public phone, it emits DTMF tones (the beep-boop push-button sounds) to dial the phone number. Product Name: Quick Dialer QUICK DIALER Model Number: QD-900 Manufacturer: Casio CASIO The size of a business card is 95mm x 62mm