The sensitive 3-channel switchable receiver enables reception of all above mentioned EL-435 transmitter type models. Offers about 300% more transmitting range in comparison with the use of any [...]

2-channel switchable receiver and voice activated recorder, all in a small metal housing. Provided with flip-up cover which can be closed during recordings. Battery powered and compact sized [...]

The EL-435 miniature transmitter ‘telephone type’, can be easily installed in series onto the telephone cable, behind a PTT wall socket or inside the telephone instrument itself.