This is Walkera Brushless Motor Activator 40A ESC

It can be used for the following RC Helicopter: Walkera 36, 37, 39, 56, 59, 60 and all other compatiablity rc toys. 

It can be used with WK-WS-20-001 180L or WK-WS-28-003 380S (Recommanded) Brushless Motor.

SPECIFICATION: 

• Sustaining Voltage: 6-17V
• BEC Current: 3.0A
• Continuous output current: 40A
• Instant max current: 60A
• Inside impedance 0.0033
• Reversion: Yes
• Low voltage, cut electricity protection: Yes
• Weight: 33g

PACKAGE INCLUDED:

• Walkera WK-WST-40A Brushless Motor Activator 1 Unit