best response times respond via handheld radios, and the dispatcher confirms the appropriate members. Two members will typically respond directly to the call in their private vehicles. A third member retrieves an ambulance from a base location. Each directly dispatched Hatzolah volunteer has a full medical technician "jump kit" in their car, with oxygen, trauma, and appropriate pharmaceutical supplies. Paramedic (EMT-P) members carry more extensive equipment and supplies, including EKG, IV, injection, intubation, and other pharmaceuticals. Each volunteer is called a unit (as in, a crew of one) and is assigned a unit number that starts with a neighborhood code, followed by a serial number for that neighborhood (e.g., "Q-120" means "Queens unit number 120"). Ambulances also have unit numbers in the same format, with the first few numbers for each neighborhood reserved for the ambulance numbers. Some neighborhoods have begun to assign 3-digit unit numbers to their ambulances, using numbers out of the range assigned to human member units (e.g., 900-numbers). In some areas there may be periods where coverage is not strong enough, for example on a summer weekend. When this happens, coordinators may assign an on-call rotation. The rotation may still respond from their houses, or they may stay at the garage through their shift. In such periods, Hatzalah functions closer to a typical EMS crew setup, though the dispatchers may still seek non-on-call members to respond, and there will still often be a non-ambulance responder as first dispatched, even if that responder starts from the base. In Israel, United Hatzalah relies upon mobile phone technologies which include an SOS app and a special emergency phone number, 1221, with messages to news organizations distributed by WhatsApp. Response times Hatzalah's model provides for speedy first responder response times. Each Hatzalah neighborhood's response time varies. For example, in Borough Park, Brooklyn, daytime response in life-threatening emergency are between 1–2 minutes, and nighttime response times are 5–6 minutes. In the Beverly-La Brea neighborhood of Los Angeles, response times average at sixty-to-ninety seconds. In Israel, the response time is under 3 minutes. Organization Hatzalah is not a single organization. Each chapter operates autonomously, or, in some cases, with varying levels of affiliation with neighboring Hatzalah chapters and under a central association. In New York City's Hatzalah, there is a very simple operational hierarchy. Usually, there are two or three members who are "coordinators", managing all operational aspects of the chapter. As