Eltako Wireless 2-way handheld transmitter without battery or wire, with rocker, aluminium/anthracite-soft FHS2-al/anso

Wireless 2-way handheld transmitter with rocker aluminium/anthracite-soft, 49 x 47 mm, 16 mm high. Weighs only 37 grams. Generates the power for wireless telegrams itself when the button is pressed, therefore there is no battery.