Yorkie™ contraband cell phone detector is a handheld receiver designed for covert wireless contraband detection. Yorkie’s light weight, sleek profile and color touchscreen make it ideal for all day use by security personnel, corrections officers and any law enforcement agent requiring a NO CELL PHONE policy in their facility. It is small enough to fit into most pockets to offer vibrating alerts all day to security personnel. This dedicated receiver is ultra-sensitive and able to sniff out all active all cellular 3G/4G/5G (non-mm wave frequencies) use up to 150 feet away from any cell phone and even hidden GPS trackers using an included removable SMA antenna or optional direction finding antenna for pinpointing cellular use up to 1/2 mile away outdoors (line of sight). And since the receiver is passive and does not communicate nor intercept any cellular data at all, it is completely legal and RF invisible – no court orders or warrants required to operate in the field.