Big stroke and bore two-way air pump breathes calf both in and out. Use suction stroke first to gently remove mucus from breathing passages, then gently inflate lungs. Remove pump to allow deflation, using slight pressure on chest. Repeat in 10 second intervals as required. The HK calf resuscitator can also be used during difficult births (if nose is exposed) to keep calf breathing and alive. Instructions for use included. Made in Germany by Rheintechnik, under the well known HK brand. Metal body with rubber nose-mask. Robust tool for field use.