MR.RC Simonk 20A 5V 3A 2-3S Lipo Brushless ESC Electric Speed Controller for RC Toys Quadcopter Drone UAV

Features:

This hardware, with the SimonK firmware, gives you the perfect solution for multirotor use:
Highest efficiency 100% N-FET design.
Highest accuracy with Crystal Oscillator (Temperature won't affect the PWM operating range like other cheap ESC's).
No low voltage cutoff, because any cutoff in a multirotor = crash.
No over temp cutoff, because any cutoff in a multirotor = crash.
Super high refresh rate, no buffering of the input signal, resulting in more than 490Hz response rate.
16KHz motor frequency, giving fastest response of the motor, and quietest operation as well (no 8KHz squeal).
Super simple, foolproof operation! Nothing to program other than the throttle range.

Package list:

Specifications:
Max cont. current: 20A
Voltage: 2-3S lipo, 5-8 Nicad
BEC: 5V/3A
Main part Size: 58 x 26 x 7mm
Cable length: 250mm(longest)
Color: black
Net weight: 23g
Package weight: 36g

 Package Includes:
1 x ESC
1 x users manual

1)Payment
We accept T/T, Western Union, Escrow and cash as payment method.
Cash payment is only available for the customers those can come to our office or store.
We request 100% prepayment before we ship. If your order is too big and our cargo cannot be ready within 7 business days, we request 30% deposit; the other 70% should be paid after the cargo was ready.
We never accept COD term and partial payment, no matter how big your order is. Please understand this.

2)Quality Check and Warranty
We check our products one by one before we pack and ship to make sure they are all what you ordered, to make sure the quantity and in good condition.
We provide 3 moths international warranty. You can get free exchange or repairing service within this period since you paid. We are responsible for all the charges and fees caused by exchange or repairing service.

3)Packaging
We usually pack our products by normal plastic bags or bubble bags and use cartons as outer packaging. We always choose the best and safe packaging material to make sure your orders won’t be damaged during delivery.

4)Shipping
Usually we use traceable international Express service to ship. We ship within 3 business days after your payment was cleared. If your order is too big and our cargo cannot be ready within 7 business days, our shipping time should be longer.
We accept drop shipping and domestic pickup

5)Return and exchange
We provide 20 days unconditional return and exchange service; you pay all the charges and fees caused by return and exchange