This document specifies requirements for user-powered resuscitators intended for use with all age groups and which are intended to provide lung ventilation to patients whose breathing is inadequate. User powered resuscitators are designated according to ideal body mass range. NOTE 1 Patients being treated with a resuscitator can be ventilator-dependent. Example user-powered resuscitators include: ¾ð -self-inflating bag resuscitators intended to be squeezed by the user s hand and refilled by elastic recoil; and NOTE 2 Self-inflating bag resuscitators are generally transit-operable. ¾ð -flow-inflating bag resuscitators intended to be squeezed by the user s hand and refilled by a flow from a medical gas source. This document is also applicable to those accessories that are intended for use with resuscitators where the characteristics of those accessories can affect the safety of the user-powered resuscitator. Examples of such accessories include such as masks, PEEP valves, capnometric indicators, manometers, metronomes, flow restrictors, filters, gas refill valves, oxygen gas mixers, connectors, point-of-use packaging, electronic feedback devices, electronic sensors and transmission of data to other equipment. This document does not specify the requirements for: ¾ð -gas-powered emergency resuscitators, which are given in ISO 10651-5[8]; ¾ð -electrically-powered resuscitators; ¾ð -gas powered resuscitators for professional healthcare facilities; and ¾ð -anaesthetic reservoir bags, which are given in ISO 5362[4]. NOTE 3 This document has been prepared to address the relevant essential principles[22] and labelling[23] guidances of the International Medical Devices Regulators Forum (IMDRF) as indicated in Annex D. NOTE 4 This document has been prepared to address the relevant essential principles of safety and performance of ISO 16142-1:2016[11] as indicated in Annex E. NOTE 5 This document has been prepared to address the relevant general safety and performance requirements of European regulation (EU) 2017/745[21] as indicated in Annex F.