Item Description DIY Keypad DTMF Tone Receiver Decoder SMT / SMD DTMF-SM2 KIT is Assembled and tested Set of 3 ( three ) kits - Schematic is included with kit. - Operating Voltage is 5V - Slim Design Quantity - 3KIT Specifications Product Description: Datasheet is for reference only, and may not match the actual datasheet from the specific manufacture . Please refer to description on top for actual specifications. Click to Enlarge images. Shipping Advice When you want to buy other listings and save on shipping you must remember to pay for them only after you are done buying all the listings. will assemble a discounted invoice and save you the shipping cost.In case that it does not happen don't pay yet, just use "contact seller" and say "please send me an invoice," I will calculate the discount for you, then will send you a new paypal invoice. Other Items In our store: