This is the OCA-170 70A 50V High Voltage Electronic Speed Control from O.S. FEATURES: For airplane usage Low voltage cut-off stops motor before control is lost and cells are over-discharged Battery type and cell number recognition Start protection guards against involuntary starting of motor No signal cut-off switches ESC off when transmitter signal is not received Anti spark function reduces sparking when connecting power battery Extension wire for O.S OCP Programmer (programmer not included) INCLUDES: OCA-170 70A 50V Electronic Speed Control with pretinned Motor and Battery Leads, 12" (305mm) Extension Wire, Receiver Connector and Instructions REQUIRES: Brushless motor such as the O.S. OMA-3825-750 OSMG9530 and the OMA-5020-490, OSMG9540 Battery connectors of modeler"s choice (O.S. motors listed above include ESC connectors) Will need to use a receiver battery with this ESC. No BEC SPECS: Cell Handling Capability: 14-36 NiCd/NiMH, 4-12 LiPo Function: Forward-Stop-Brake-Reverse Peak Load Current: 70A (85A 5 seconds) PWM Frequency: 32kHz Protective Function: Start protection/Low Voltage/ No Signal cut-off/ Overheat protection Parameter Setting: ESC/ESC Programmer OCP-1 (optional extra) Dimensions: 3.1 x 1.1 x 0.55" (78 x 29 x 14mm) Weight: 3.1oz (89g) jxs 01/04/12 ir/jxs updated jpg 9/5/12