With plug for your BMW (Article 90012)
Without plug but with a cable and clips which you can connect direct to your battery in order to charge it without disconnecting. (Article 208-037)

Diagnoses, recovers, charges, checks & maintains your battery automatically for months. All major battery manufacturers recommend maintaining starter batteries FULLY CHARGED during periods of non-use. Optimate 4 is totally safe for months-long connection and maintenance of irregularly or seasonally used batteries even while still connected to the vehicle. The sophisticated charging algorithm ensures no risk of over-charging. For 12 V batteries to 32 Amp-hours.