This is an original civilian general aviation two piece radio receiver set type 402A. I do not know if they still work.This item is being sold as a collectible.
eBay
Extension Wire MOC 25cm 50cm for Power Function Servo Motor IR Remote Control Receiver for 8871 8886 8293 Bricks Toy fit Legoeds
Aliexpress UK
The Blade BLH7501 4-in-1 Control Unit is a high-quality component designed for Blade RC model helicopters. This control unit combines the receiver, electronic speed controller, mixer, and gyro functions in a single package, providing a convenient and reliable solution for electric-powered helicopters. Suitable for advanced hobbyists aged 17 years and up, this product is manufactured in China by Blade, a trusted brand known for producing top-notch RC parts and accessories.
eBay
Huepar 4D Cross Line Laser Level High Accuracy ±2mm/10m Self Leveling Green Laser Tools With 8000mAh Li-ion Battery & Receiver
Aliexpress UK
Creator(s): Bain News Service, publisher. Title from unverified data provided by the Bain News Service on the negatives or caption cards. Title: German aviator receiving orders. This Photograph is aArchive Quality Reproduction created directly from the original photograph.
eBay
HotRC F04BT 4CH 2.4G Gyro Mini Receiver PWM 4V-9V for RC Drift Car Aircraft Tank Boat Toy Part CT-6A HT-8A DS-600 CT-6B CT-8B
Aliexpress UK
eBay
Retekess T112 Restaurant Pager Wireless Calling System 30 Coaster Vibrator Receivers 3 Prompt Modes For Cafe Food Court Clinic
Aliexpress UK
The universal HF radio receiver "US-P" was produced possibly since 1948. The receiver is a superheterodyne with one frequency conversion, has a range from 173 KHz to 12 MHz, divided into five subbands.
eBay
LEUS U2 UHF Wireless Microphone Converter XLR Transmitter/Receiver Microphone Wireless System for Dynamic/Condenser Microphone
Aliexpress UK
(1 x 200MHz LPF Low Pass Filter). Used to receive FM, aviation, V-band walkie-talkie signals;. The factory silk screen batch number is different.
eBay
LEUS U2 UHF Wireless Microphone Converter XLR Transmitter/Receiver Microphone Wireless System for Dynamic/Condenser Microphone
Aliexpress UK
Bandwidth: 6MHZ. for enhancing intercom receiver sensitivity, increasing the intercom call effect. Power Capacity: 50W. Interface Type: BNC. Increase Profit: 3.5dBi. Great for making calling distance further and calls clearer.
eBay
YEVOLT 12-line Laser Level YVGLL4XS12 Manual/Auto Working Range 30m/100m (with Receiver) Ceiling Lighting Long-Term Cost Saving
Aliexpress UK
For enhancing intercom receiver sensitivity, increasing the intercom call effect. Interface Type: BNC. Frequency range: 118~136MHz. Increase Profit: 3.5dBi. Power Capacity: 50W. Great for making calling distance further and calls clearer.
eBay
UGREEN aptX HD Airplane Bluetooth 5.3 Receiver Transmitter for All Headphones Wireless Audio Aux Bluetooth Adapter for TV Flying
Aliexpress UK