Wireless Hand Remote Controller for Cayman B GPS Gen 1.5 – 2.4GHz Bluetooth/WiFi, USB charger , 3.7V/1100mAh LIPO battery. Suitable for 50736 & 50737.  Comes with charging cable and lanyard. NB Only suitable for use with Gen 1.5 firmware Cayman B GPS motors, does not work on Gen 1.6 firmware models.