This is a promotion combo released recently, the combo contains 3x HD-2215S digital metal gear servos for swashplate, and one digital metal gear servo HD-3688MG for tail servo, and the combo is priced for the 3xHD-2215S servos, so the tail servo is free, means you buy three (2215S） and get one more free (3688MG).

Specs of 2215S:
Weight: 14.2 grams
Torque: 2.2KG（4.8V）2.6KG（6V）
Speed:0.12″（4.8V）0.09″（6V）
Voltage: DC 4.8 - 6V
Dimension: 32.3x12x28.3mm


Specs of 3688MG:
Weight: 29 grams
Torque: 2.5KG（4.8V）3KG（6V）
Speed:0.07″（4.8V）0.06″（6V）
Voltage: DC 4.8 - 6V
Dimension: 48.4x15.1x34.4mm

Includes:
1 x digital servo 3688MG
3 x digital servos 2215S

Hint:
The slogan of "Buy three get one more free" on the product image means buy 3x HD-2215S servos then get 1x 3688MG for free, so you get 4 servos in total, it does NOT mean you buy 3 combos and we send 4 combos.

Please explain:
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