Home / Accessories / Extra Whistle Extra Whistle $10.00 In stock Extra Whistle quantity Add to cart SKU: Extra Whistle Category: Accessories Description The extra 12-volt DC whistle can be connected to the receiver to make it louder, or it can be located in another room or building by wiring it with two-strand doorbell wire. Related products CR123 Batteries (4 pk) $10.00 Add to cart LOUD RINGING BELL $24.99 Add to cart BH-1 Bird House $15.00 Add to cart P-250 Replacement Probe w/ 250′ Wire $149.00 Add to cart